Just yesterday I noticed this problem and I'm not sure where to look, what to read, which log to download....
For some reason, I go to launch the drone as normal, it goes in to Arm mode, normal tones, propellers start up with holding the Down + Right, but it doesn't gain power enough to launch.
I've tried multiple batteries.
I've re-calibrated the transmitter, because it was as if it wasn't getting above half throttle, but this didn't change.
Any other tips I should try? Where should I go and what should I read?