iPhone 6:
I had 2 days where My controls were fixed in a bad position (a rolling corkscrew) I could almost fly straight if I held it just right.
Then on the third day the timer (at the beginning of the game) showed up with "hold steady while calibrating" and I had several good games. Sensitivity was definitely diminished but everything worked properly. Several other players seemed to be able to turn better than they had before... they were more of a challenge anyway. I went up against a couple who I believe are on PC who were now turning faster than I was, not too much, just a bit.
Then later I tried to play and found the controls had slipped where I had to hold my phone at a much steeper angle than what I find comfortable, otherwise things were still working. Then I upgraded my operating system to OS10. Now I get the "hold stead while calibrating" timer each game and things seem to work fine.(mostly)
I don't mind having the sensitivity set automatically but I'd like it if it was set higher for all. If it's at 70% now, I'd like if it could be set for 85% instead.