Phantom 4 Pro Switches to Atti when in P mode

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My Phantom 4 Pro has been sitting for over two years without a flight so today I charged the batteries and took it for five flights just to make sure it still flew well and the batteries were good. On the last flight when I was coming in to land in P mode, it started drifting like it was in Atti mode. No worries, I like Atti mode. Before hand-catching it I switched back and forth from Atti mode to P mode a few times to see if it would regain P mode but without success. Granted, even two years ago I had the same issue of it suddenly drifting when in P mode and updating the firmware and calibrating the IMU did not fix the issue. Just to make sure all was set, I reupdated the firmware and calibrated the IMU before todays flights. So, I'm curious why this is happening. Can anyone provide insight? Here's a link to the aircraft .DAT file on dropbox: Phantom 4 Mystery Atti mode
 

Meta4

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Thanks! Here is the air data link. Hopefully it is the correct file. The issue occurred in the last minute or so before landing and I did switch back and forth from Atti to P to try and correct it, but without success. Phantom 4 Mystery Atti mode
It's not a case of the aircraft switching to Atti Mode and ignoring GPS data.
In this incident the number of satellites dropped to zero which left the drone in Atti Mode.
Recalibrating the IMU or updating firmware wouldn't have had any effect on this.

If it's still unable to find satellites, the issue is likely to be a malfunctioning GPS module or a bad connection to it.
 
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It's not a case of the aircraft switching to Atti Mode and ignoring GPS data.
In this incident the number of satellites dropped to zero which left the drone in Atti Mode.
Recalibrating the IMU or updating firmware wouldn't have had any effect on this.

If it's still unable to find satellites, the issue is likely to be a malfunctioning GPS module or a bad connection to i

Thank you Meta4! Given how often is was happening a couple years ago that makes sense. I really appreciate your help!
 
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As strange as it may sound, try replacing the SD card and formatting it in the aircraft. If the aircraft can’t write and read the memory card it will behave erratically and not properly record video and photos.
 
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As strange as it may sound, try replacing the SD card and formatting it in the aircraft. If the aircraft can’t write and read the memory card it will behave erratically and not properly record video and photos.
Hmmm, well, photos and videos are recorded mormally. I'm sticking with Meta4's diagnosis.

By the way what does the memory card have to do with the drone's flight characteristics?
 
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Hmmm, well, photos and videos are recorded mormally. I'm sticking with Meta4's diagnosis.

By the way what does the memory card have to do with the drone's flight characteristics?
Temporary data is written to the card during flight, if it can’t write/read fast enough it causes the computer to have problems. See it happen 4 times over the last 3 years with my P4p. Change the card and problems went away. I’ve had a similar atti mode problem that nearly cost me the bird due to high winds. Give it a shot, it only takes 2 minutes, what have you got to lose?
 
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Meta4

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Temporary data is written to the card during flight, if it can’t write/read fast enough it causes the computer to have problems. See it happen 4 times over the last 3 years with my P4p. Change the card and problems went away. I’ve had a similar atti mode problem that nearly cost me the bird due to high winds. Give it a shot, it only takes 2 minutes, what have you got to lose?
Sounds like it was just a coincidence.
DJI drones fly perfectly without any SD card and they don't need to write anything to the SD card to fly normally.
The camera is completely independent from flight control or GPS reception.
 

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