M600 turns off when connected to PC and batt full charged

[Guest eddscott]

When I connect my M600 to my PC, its fine until its fully charged. It then just shuts off and I have to take our and replace the battery in order for it to come back on.

I've had the phone replaced and its still doing it. Sometimes it just shuts off and when back on it says battery power remaining unknown.

Would this suggest the battery is faulty in some way?