After analyzing the flight logs I came to the conclution that that it´s some kind of drone HW/SW error so I created a repair case.
When checking the case update status it says I´m supposed to send something in. There is however nothing to send in.

@DJI please advice

I think you are supposed to send in the drone. I think you are screwed....

Yeah, they told you better NOT to fly above water, now you know why…

Hi Swedrone, we are so sorry for your loss, I managed to get the case number via your Forum account and the data analysis has been applied, nothing needs to be sent in. Our data analysis team will figure out what happened and provide the proper resolution, please wait patiently, thank you.

DJI Mindy Posted at 2-11 03:33
Hi Swedrone, we are so sorry for your loss, I managed to get the case number via your Forum account and the data analysis has been applied, nothing needs to be sent in. Our data analysis team will figure out what happened and provide the proper resolution, please wait patiently, thank you.

Thank´s a lot for your help and prompt reply. I´m personally very happy with all my DJI products and  interactions with DJI. Keep up the good job!

DJI Mindy Posted at 2-11 03:33
Hi Swedrone, we are so sorry for your loss, I managed to get the case number via your Forum account and the data analysis has been applied, nothing needs to be sent in. Our data analysis team will figure out what happened and provide the proper resolution, please wait patiently, thank you.

Great service.

Of course, you opened a repair case without the to be repaired product... what are you expecting. What you want to do is open a ticket and file a warranty claim.

El Diabolico Posted at 2-11 04:42
Of course, you opened a repair case without the to be repaired product... what are you expecting. What you want to do is open a ticket and file a warranty claim.

There is no such option on the support site

https://www.dji.com/se/support

Even with care refresh you must send the remains of your drone after a crash to DJI to receive a new one. Sure DJI will probably tell you what went wrong, but I don't think your get a replacement drone out of them. They may offer you a drone only at 15percent discount.  I may be wrong but
will be an interesting case to watch.

Swedrone Posted at 2-11 05:17
There is no such option on the support site

https://www.dji.com/se/support

Ask to chat with one of DJI reps and they will guide you through the warranty process (if the analysis of your flight log shows that there's some problem with the drone).

MarcelN Posted at 2-11 02:31
Yeah, they told you better NOT to fly above water, now you know why…

Correct me if I am wrong, but I thought flight over water was discouraged only if you were below the visual obstacle avoidance altitude, around 35 feet I think. If he was flying less than that prescribed altitude minimum for visual obstacle detection, then I can see the case for DJI saying "sorry, can't replace the drone under warranty". But if above that altitude, I would think a replacement would be in order if the telemetry shows a drone error. Thoughts?

Well without seeing the flight logs (please upload OP) its hard to say, the OP claims hardware or software failure, easy to say without any evidence to backup their claim.
Flying over water is fine, I do it all the time, but you have to accept the risk that if it goes down there is little chance of recovery and without the aircraft returned to DJI for inspection, proving any fault is nearly impossible.

I am guessing he sent in his log files for analysis? That's all he has, 'cept his controller....
You can post the logs here and we can try to figure out what happened...

DJI already replied #4

The OP does not have to do anything else at this stage.

Swedrone Posted at 2-11 03:39
Thank´s a lot for your help and prompt reply. I´m personally very happy with all my DJI products and  interactions with DJI. Keep up the good job!

Some sort of relief.
Hope you get it fixed.
I miss the Sweden footage!

Swedrone Posted at 2-11 03:39
Thank´s a lot for your help and prompt reply. I´m personally very happy with all my DJI products and  interactions with DJI. Keep up the good job!

Hi Swedrone, we appreciate it. Should you have other concerns, please don't hesitate to reach us. We're here to help. Thank you for your patience.

In the place of  DJI, I would award you a drone whenever you suffer an accident. So that you, God forbid, never have a day without a drone.
Because your videos and your experience is unique.

Swedrone Posted at 2-11 05:17
There is no such option on the support site

https://www.dji.com/se/support

Do you have flight log you could post ?

DJI Mindy Posted at 2-11 03:33
Hi Swedrone, we are so sorry for your loss, I managed to get the case number via your Forum account and the data analysis has been applied, nothing needs to be sent in. Our data analysis team will figure out what happened and provide the proper resolution, please wait patiently, thank you.

Number one reason to join the forum. Seeing this post and others where an Admin chimes in and gives good news or just helpful advice is wonderful.  When I decided I wanted a "camera drone" I knew DJI would be the only choice to make.  Nice Job!

I am just chiming in because I hope DJI replaces the drone. Sorry for your loss.
Just curious... when a Mavic hits the water does it make a "bloomp" sound or just a "sploosh" sound?
I hope I never have to find out! My heart would sink with it!
Also.. would you be able to dive for it? or is it too deep?

JPilotR Posted at 2-11 08:43
Correct me if I am wrong, but I thought flight over water was discouraged only if you were below the visual obstacle avoidance altitude, around 35 feet I think. If he was flying less than that prescribed altitude minimum for visual obstacle detection, then I can see the case for DJI saying "sorry, can't replace the drone under warranty". But if above that altitude, I would think a replacement would be in order if the telemetry shows a drone error. Thoughts?

That's correct.  DJI doesn't discourage you from flying over water.  They just warn you that the visual positioning system can be fooled if you fly to low over a reflective surface.  If you're flying a few meters above the water or more you should be OK.

Bjs_express Posted at 2-12 11:35
Number one reason to join the forum. Seeing this post and others where an Admin chimes in and gives good news or just helpful advice is wonderful.  When I decided I wanted a "camera drone" I knew DJI would be the only choice to make.  Nice Job!

Thank you so much for your kind words and support to DJI, we will keep up the great works and provide more professional customer service. Enjoy flying.

Good luck getting DJI to admit a fault with your drone. I lost a P4 to the ocean and I wasn’t over the water at the time it just decided to do its own thing Ihad no control and it flew about 300 mtr out over the ocean doing acrobatics along the way then fell from the sky. PLOP,!!!! GONE

JPilotR Posted at 2-11 08:43
Correct me if I am wrong, but I thought flight over water was discouraged only if you were below the visual obstacle avoidance altitude, around 35 feet I think. If he was flying less than that prescribed altitude minimum for visual obstacle detection, then I can see the case for DJI saying "sorry, can't replace the drone under warranty". But if above that altitude, I would think a replacement would be in order if the telemetry shows a drone error. Thoughts?

Your reasoning is about right.

Alexei Merinov Posted at 2-12 03:04
In the place of  DJI, I would award you a drone whenever you suffer an accident. So that you, God forbid, never have a day without a drone.
Because your videos and your experience is unique.

Thank´s for your support, very kind of you.

There is of course a video of the incident, sorry for the quality, its compiled from the cached 720p footage in the GO app

That doesn't look like the ocean.

Swedrone Posted at 2-19 07:15
Thank´s for your support, very kind of you.

There is of course a video of the incident, sorry for the quality, its compiled from the cached 720p footage in the GO app

Lots of steel in that bridge....why does the video stops too early ?

Would be interesting to see this flightrecord, if you like post it on here.

cheers
JJB

R&L Aerial photography Posted at 2-11 02:29
I think you are supposed to send in the drone. I think you are screwed....

Steel bridge greatly interferes with GPS, and RC signal transmission. It is not related to water. Over 5% of crashes happened that situation as you if you can read Chinese from the website www.kanzhaji.com.

Hello,  dear !
Is there an end to your story?
He is happy or not very ???
I found that you deleted all your video from YouTube ...

Sky Donkey Posted at 2-11 05:28
Even with care refresh you must send the remains of your drone after a crash to DJI to receive a new one. Sure DJI will probably tell you what went wrong, but I don't think your get a replacement drone out of them. They may offer you a drone only at 15percent discount.  I may be wrong but
will be an interesting case to watch.

Correct !! ,to replacement the damaged drobe should be returned to dji.

Alexei Merinov Posted at 3-10 07:09
Hello,  dear !
Is there an end to your story?
He is happy or not very ???

Hi. After some data analysis by DJI I was offered a "drone only" replacement with 15% discount. Now, without the discount and adding the shipping cost and VAT it was almost the same price (only 100 $ cheaper)  as if I went in to my DJI Store around the corner and bought a new box with the controller and the charger. Needless to say I politely declined the "offer"

Swedrone Posted at 3-11 04:48
Hi. After some data analysis by DJI I was offered a "drone only" replacement with 15% discount. Now, without the discount and adding the shipping cost and VAT it was almost the same price (only 100 $ cheaper)  as if I went in to my DJI Store around the corner and bought a new box with the controller and the charger. Needless to say I politely declined the "offer"

Tyvärr!

Joe.Mavic.D.HH Posted at 3-11 06:15
Tyvärr!

why ??

JJB* Posted at 3-11 06:59
why  ??

I replied to my friend swedrone and thumbs down for the "generous" offer from DJI.

Joe.Mavic.D.HH Posted at 3-15 06:12
I replied to my friend swedrone and thumbs down for the "generous" offer from DJI.

oke, now i understand.
Ofcourse you know the cause of this crash, that`s why the thumbs-down, without seeing a flightlog.

Update: Drone found after 6 months!

”That will buff right out”

Finding Mavic Part 1 - The Search
Finding Mavic Part 2 - The Rescue

Looking at the original video it looks like a clear case of operator error.

Very low under a metal bridge (with people on it!) so a fair chance of compass interference, GPS loss and controller loss, maybe at the same time.  Also dark so visioning unlikely to work.
The 15% discount seems fair.

so very happy that you rescued the drone,  now would DJI replace the drone under care refresh? These videos that I viewed were amazing, thank you so very much Swededrone, you may not recognise me but quite a while back you gave me some very good advise on photography which I have used and retained, thanks again friend, oh and I also subscribed to your YouTube channel.

Picanoc Jack Posted at 8-21 17:19
so very happy that you rescued the drone,  now would DJI replace the drone under care refresh? These videos that I viewed were amazing, thank you so very much Swededrone, you may not recognise me but quite a while back you gave me some very good advise on photography which I have used and retained, thanks again friend, oh and I also subscribed to your YouTube channel.

Thanks for your kind words and for your subscribe. Getting a lot of negative feedback from posters but they were not there they don´t know, they are judging from the bench. Thanks again friend!

Swedrone Posted at 8-21 08:49
Update: Drone found after 6 months!
Finding Mavic Part 1 - The Search https://www.youtube.com/watch?v=JGeCwt58xX0
Finding Mavic Part 2 - The Rescue https://www.youtube.com/watch?v=7ey-W-JBRTs

Good job on getting it back,  now will DJI Care Refresh owner this one I wonder?