Finally getting some good weather up in the Portland, Oregon area, yay. P3A, DJI Go Android 2.7.1, P3 firmware 1.7.60, RC firmware 1.5.80. I flew four batteries last weekend with no issues whatsoever. Today I took it out, did the usual pre-flight, and took off. I usually take off manually (P-GPS) and hover at about 5-10 feet just to check things out before heading out. It typically might move around an inch or two in any direction at first, but usually quickly establishes a steady hover and maintains position. Today, however, it did not. It went into a horizontal orbit. It maintained level facing the same direction, but moved in an approx. 2 foot circle around the home point. I took it up a little higher, about 15 feet or so, and gave it a little forward pitch. Rather than moving straight ahead, it moved ahead and a bit aggressively to the right. It was very difficult to control directionally with pitch and roll. The yaw seemed fine. If I tried to stop and hover, it either drifted a lot to the right or went into the same orbit pattern. Since I was in a clearing surrounded by trees I got a little spooked and landed right away, power cycled everything, and recalibrated the remote and the compass. Took off again with the same issues. It seemed have a great GPS lock and everything. I moved to a different location (a big open field about 0.5 miles away) just in case there were some buried power lines or something throwing the compass off. I recalibrated the RC and compass at the new location. At first it did the same thing at the new location. But after flying around slowly for a minute or two it stabilized and hovered in position. I flew around higher and further and it was mostly stable. A couple of times it veered off to the right again, but it didn't feel like the controller inputs were getting the same response as usual (especially pitch and roll) and when I landed it was not as positionally stable as usual for the last few feet down to the ground. Nothing has happened to the P3 since last weekend, it was just stored normally, not dropped or bumped around or anything. I keep it and transport it in the DJI hard shell case, and put the case on the back seat in the truck so it's not rattled around when transported. Any ideas how to best debug what's happening? I'm going to take it out again tomorrow morning to a different location, so if you have any tests or things I can try to figure out what's up, that would be most appreciated.