Suggestion: Check to insure that you have a good link between your hand-held RC and the drone itself.
I had a good one during an afternoon flight this week, but then when I went out in the evening to shoot some sunset photos the drone acted sluggish and it wouldn't obey my control stick inputs.properly - sluggish response, incorrect response, unpredictable response. It would not RTH nor would it auto-land.
I literally had to re-learn to fly it manually "on the fly" (pun intended) - pushing forward on the right-hand stick made it move forward AND SIDEWAYS, pulling back on that stick made it move backwards AND SIDEWAYS. Moving the right-hand stick side to side moved the drone side to side - AND forward and back!
Not know how long I was going to have any semblance of control of the drone, I decided the best thing to do was to get it on the ground ASAP. Luckily the throttle stick worked as advertised and I was finally able to get it back on the ground without a crash or any damage damage, but it ended up being about 200 yards from where I was originally trying to land it. I was lucky that I didn't lose it it the swamp water that surrounded the place I was flying!
Turned out I didn't have a good RC-to-aircaft radio link. I don't know how or why that happened, but when I did a complete re-link routine the problem cleared up immediately and I had no further problems.