To answer the OP, I found at least with the M2, if you launch with the controller switch in S mode, it will actually be in P mode with a warning and information that the switch is in S mode, but it will fly in P mode instead. It's real easy to accidentally knock that switch to another mode and not realize it, especially if you put the RC into a bag for storage/transport.
If you get that warning but really wanted sport mode, just flick to P, then back to S.
If you get that warning but really wanted sport mode, just flick to P, then back to S.
