Just seemingly stopped working mid-ride, and now the wheel spins freely with none of the usual resistance. Will give cleaning the contacts a try though, thanks
I've had that happen a number of times and every time it was just a matter of spraying with contact cleaner - letting it evaporate and the apply a generous layer of white vaseline to the inside of the hub connector.
The wife's even had a period of flickering during riding which was fixed as well.
How did it die?
If you've just lost power you might just need to clean and lube the contacts