I flew one flight today with no problems. On my second flight, after observing I had 12 satellites locked, i started the motors, launched it about 20' for a hover test... and it's drifting and not stopping.. so then i noticed the LEDs were blinking yellow indicating it's in ATTI mode. I look down at my controller, it's clearly in GPS mode (S1 in top most position), I look at the app, and it still fluctuating between 11 and 12 satellites... so I switch to ATTI mode, then back to GPS, and still no GPS mode... WAIT.... holy crap.. right after writing the above... i went back into the assistant app, and checked my controller... the S1 switch when in GPS mode is identified in the app as ATTI.. so i pushed up a little more on the switch and low and behold, it now says GPS... my switch isn't making full contact in the up most position! weird... anyone else experience this? Look like i'll be taking my controller apart... argh... good thing i caught that.... Lesson learned... ALWAYS do a hover test!!!