I've been meaning to post this for a while because I have found noone on here with this issue. P3P - iOS App 1.1.2 - FW 1.2.6
When I power the motors up and if I don't lift off promptly the bird wil take flight on it's own.
This wil happen when returning from a flight as well if I don't power off promptly.
I don't know exactly what it's mission wanted to be because I bring it back down from a few feet immediately.
Not really a problem as I steer from the triggers.....but it's strange.
I think I will have to see next time what it does and get ready to switch to ATTI

My P3P running FW 1.1.9 does not do this.

Started happening to me after the last upgrade.

Did you calibrate the RC?

Common problem, I had something similar, was fault with that fw and vps. Upgrade to new fw just out fixes it.