Glad it worked for you!
Interested to know if it does it again at 2 bars. I wonder if your computer is set to the right voltage - sometimes they ship set to 36v rather than 48v. Easy fix and probably not the problem, but never hurts to check. I do know that the battery indicator is all wonky when at this setting.
If you'd like
a video - at the 1:45 mark it tells you how to check and set the default voltage on the bike. Shoutout to
CitizenCycle.
Otherwise:
Press the "+" and "-" and POWER buttons together. The initial screen is the CURRENT voltage setting (s/b 48), it then shows 36 and shuts off. You just set your bike to 36v. Repeat to reset to 48v. You would NOT repeat this if the display shows 36 on the first screen. If i'm not being clear, this process shows the CURRENT voltage setting and then RESETS it to the second setting (either 36 or 48). Hope that makes sense. Perhaps the video is easier