Hi, I have started getting the error code 98 (The controller stops working (possibly over current,blocking, under pressure, over temperature), and then the bikes shuts off completely while driving. Very dangerous in while driving in the dark... 

I suspect it is a safety shut down, but don't know and what causes it. Maybe bad battery, short circuit or .... ? 
Have any of you guys had a similar experience or/and have any suggestion on what to do?