I have P3A with FW 1.3.20. I have notice, after update, it can not hover in precise alttitude (VPS off).
Before update, it was rock solid.
I have also problem with alttitude reading. Before take off it is 0 meter, but after 15 min flight, alttitude is 15 meter too high on ground level (home point). The issue came after update.

I have calibrate (cold) IMU....

I've noticed it to..  It's not obvious but it's doing it

..yes, it is not obvious. But 1.1.9 was more stable. How about your alttitude? Have you got correct reading?

My bird same isseu when in auto take off it will not hover stable but it,s coming back to the ground if you dont wacht out, but for me no big isseu, alti readings are normal..

Hey guys.... VPS assists in both auto take-off and landing by telling the phantom when it achieves its correct "spot" . Disabling will affect these. It may be why you aren't holding height, especially if you are closer than 10 feet to the ground. Just a suggestion...

I noticed the same after upgrade. Returning to previous fm?

geo33 Posted at 2015-8-22 16:52
I noticed the same after upgrade. Returning to previous fm?

Please disregard - after proper compass calibration all goes perfect.

I found that re-calibrating the sticks on the RC solved the problem.