I think this is some technical glitch, maybe caused by your having the wrong charge mode selected- are you using delayed charging? Or it might be some kind of low voltage problem. Monitor your charge on the myVolt website.
Also, if you have both of the charge alarms set and armed by locking your car, they will go off if he unplugs it from the car or the wall, so no, there is no sneaky way he could be doing this.
Also, if he is unplugging you, the cord would be unplugged when you returned to your car, and you did not say that is the case. Don't go postal on anybody until you really know what is happening.
Also, don't worry about his cord. It is his business if he wants to leave it somewhere while he is not using it. It does not hold the parking spot, so no need to feel put out by it.
Also, if you have both of the charge alarms set and armed by locking your car, they will go off if he unplugs it from the car or the wall, so no, there is no sneaky way he could be doing this.
Also, if he is unplugging you, the cord would be unplugged when you returned to your car, and you did not say that is the case. Don't go postal on anybody until you really know what is happening.
Also, don't worry about his cord. It is his business if he wants to leave it somewhere while he is not using it. It does not hold the parking spot, so no need to feel put out by it.