So, after almost 80 flights with zero issues at all I had a scary one today. Got to the courthouse early, and figured I'd launch from the roof of the parking garage (yeah, I know) and get a nice shot of town above the courthouse. I was very careful to check for any compass errors (again, parking garage), but all looked good so I went up to just below 400' and started to move into position for a panorama shot. At that point, the status went from "P-GPS" to "ATTI" and yellow, and the P3 started drifting with the slight breeze. I lost most control, but not quite all. Thankfully, I had seen many posts where people panicked and hit RTH in this situation, causing a flyaway (can't RTH with no GPS, right?) so I switched to ATTI mode and was able to slowly bring it back over me and down for a landing. Here's the problem(s): 1 - when coming back in ATTI mode, the controls were VERY sluggish, I had to peg the controls to get much movement at all, and wind wasn't a factor. It was really weird, I've flown in ATTI before to get used to it, and something was definitely wrong. 2 - Looking at the HealthyDrones logs, I expected to see GPS problems, but there were only a few (10-15 instead of 15+) and only close to where I landed.. Through most of the loop where I was forced into ATTI and had very little control, I had solid GPS and Compass readings. ( Healthy Drones Logs of the flight) It's shaken my confidence a little, I do have the .dat file from the drone, but really don't know what to do with it to try and unravel this mystery.. Any input from those with more flight time than me as to WTF happened?