Everything has been fine until the other day when I found the bike hadn't charged over 94% despite being on over night. Take it to work, and when I come back it now won't charge over 90% (it was under 80% when I came home, so I know the charger is at least partially working).
When I now plug it in it goes through a cycle where the charger activates (with the nice clunk), the bike spins up the fans, but draws nothing, and then goes to drawing -3 amps, before going back to 0, and the charger powers off. Then wait a few seconds and repeat.
Anyone have any idea what might be wrong? I left it a few days incase it was the extreme cold we had, but no, still not charging.