These cutoffs are very strange. I had several very long rides (up to 4000m elevation) with no issues at all. Motor worked as it should. But next ride - constant cutoffs all the time. Another ride - fine work again. But I didn't change anything! o_O
I have FC1.0 with 43V firmware and 48V battery.
A little report about my experience with the M510. I've tried all the firmware in this thread (REV_I) and they all have the problem of sudden power loss, no matter how many minutes I wait after powering up.
I'm currently running 43V firmware (my motor is 48V). I really like how it handles...