Maybe you didn't exactly bang it at low speed, low impact, just didn't realize it because of your positioning.
Ive slammed some potholes and been like oh god dammit my ass!! Then when I am paying attention and get up on my legs to go over them and use my knees as the shock absorbers, don't notice them nearly as bad, but you KNOW the bike is feeling it. maybe not as much because it's not having to counter your body weight along with the G force of the shock as well but it feels it.
Just two wild guesses pulling out of my ass....
The tip over switch momentarily flips from the jar, but since it's only a brief second, the 'error' flags, but not the 'cause' as it went away before it could figure out what specifically gave the 'error flag' so you get the gen / unspecified shutdown?
second rabbit out of my ass.... is there an over current shutdown on the motor / and or inverter.. say like it stalled or something? .... Think of the motor as sort of kind of like a fancy VFD, or a Servo with an infinity travel limit given it's regen capabilities. When you brake a servo, it's velocity is generating power and that power MUST go somewhere or you pop control cards!.. in this case you hit a hard bump it even if it's only a few RPM give the gear ratio, it slams the motor for a quick WHEEEEEP !! that sends a current spike back, and if it exceeds that 483amps, or whatever it is set to... bing, you get a shutdown... again, since it's so fast, it can't tell what caused it so general error fault. I have actually seen something similar in my past due to a misaligned travel rail, that 'bump' as it spanned track lengths was enough to cause this.
Since I don't have a clue how any of their power handling logics work,... needle, meet haystack...
It sounds good so IM running with it!!! why not, politicians run with total BS all the time heh.
Aaron