Compass error/Atti mode switch?

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So I just got home from flying yesterday and I had a weird experience. I did a IMU and gimbal calibration today. I went to my location, did the usual compass dance, put it in the air, stable, put it up about 80 feet and started flying and got a compass/atti mode error and I pulled it back real quick, it kept drifting as it said it went into ATTI mode, my heart sank for about 3 seconds because it just kept drifting and GPS finally kicked back in. Rest of the flight was ok. What would cause it to do that?
 
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Not sure what happened, but in atti mode it will drift its up to you to fly it .
 
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Had a similar experience a few days ago (Loss of GPS to ATTI) . The wind took the quad sideways quite quickly. I was in an open area so the wind would do this (approx. 200ft up) in ATTITUDE mode as previously mentioned.

I was caught off guard for a few seconds and realised what was happening and took control. Just conscious of this now are prepared to counter the effect of the wind. It's only happened once though.
 
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I've also have had this happen to me. I was about 1500 ft away from the TX. Thank goodness I've flow some quads before with gps assistance and was able to bring it home without issue.
 
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I have today a one really bad experience with my p3, it take 10 years of my life for sure. I was at open area (beach), and I felt a little bit of wind so I decide to land and quit with flight. In that moment my P3 start losing control, and when I look on my tab, I saw COMPAS ERROR. I was scared and I just try to go up (because he goes down and near houses). After 10 seconds finally he find GPS and I land with my P3 normally. What was wrong? Is problem with wind (but really not so strong)?
 
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