When i activate a RTH, my drone (Phantom 4 Pro+) doesn't respect the height that i'd progam (35 meters) and flight till 120 meters once, and 63 meters during another flight. !!!

I think it's not normal !

I saw other people met the same problem

Any solution ?

my p3s works fine.. now 1 are you already flying at those higher altitudes because it won't lower itself if it's below are th it will raise if it's above rth it will stay the same height and come back. I have no experience with the Phantom 4 or 4 plus but with all the optical sensors was there anything near it that might have caused it to raise on its own

This case has been reported and it will be fixed with the next firmware version, sorry for the inconvenience caused.

DJI Natalia Posted at 2016-12-26 13:19
This case has been reported and it will be fixed with the next firmware version, sorry for the inconvenience caused.

Is it "hard" or "soft" problem ?

Steve-76 Posted at 2016-12-25 18:23
my p3s works fine.. now 1 are you already flying at those higher altitudes because it won't lower itself if it's below are th it will raise if it's above rth it will stay the same height and come back. I have no experience with the Phantom 4 or 4 plus but with all the optical sensors was there anything near it that might have caused it to raise on its own

NO ! The aircraft flies at around 50 meters !!

Steve-76 Posted at 2016-12-26 04:23
my p3s works fine.. now 1 are you already flying at those higher altitudes because it won't lower itself if it's below are th it will raise if it's above rth it will stay the same height and come back. I have no experience with the Phantom 4 or 4 plus but with all the optical sensors was there anything near it that might have caused it to raise on its own

Please note that the OP posted in the Phantom 4 Pro section of the forum. The issue he is reporting is a known fault and has been reported before.

To avoid this, set an RTH height that is HIGHER than you plan to fly at.

Jmichel33 Posted at 2016-12-28 13:44
Is it "hard" or "soft" problem ?

It will be fixed with the firmware (Soft).

Steve-76 Posted at 2016-12-25 09:23
my p3s works fine.. now 1 are you already flying at those higher altitudes because it won't lower itself if it's below are th it will raise if it's above rth it will stay the same height and come back. I have no experience with the Phantom 4 or 4 plus but with all the optical sensors was there anything near it that might have caused it to raise on its own

Nah. It's a commonly-reported issues with this model.