Well, this is a first timer.
When I came down to the garage this morning, the CC part of charging was at it's end and there it was; CANBUS on LCD and yellow wrench. I waited for a while and they both disappeared, but the odd thing was, that the CC timer on LCD was reset back to 0:01 minutes. Luckily, I was there to disconnect the plug as I went to work, so that it wouldn't try another 1 hour of CC charging.
Just a report...
Mine does this occasionally.
Charge still completes ok - nothing to worry about.
Yes that CANbus error can happen at any time, riding or charging. Dont worry about it.