I use filters but it does that at regular speed or even stationnary .
Usually it unfreeze within less than a minute and it does not do it every flight .
But still it makes me loose precious time and always gives an extra stress .
I got the same thing and like you, I was flying above the water in Playa del Carmen. I am using the last Beta firmware, v.02.00.0106. DJI didn't give me an explanation. I landed the drone asap and it never happened since that fly.