You know what I just thought of along those same lines? Bear with me just a sec while I explain this. While charging my battery (Yes, I only have one right now) I did notice that occasionally it would get a cell count or voltage error while charging it. I have one of those 4 port chargers so I thought maybe the charge wires might have been bad so I moved it to another port and it worked fine. In hind sight, it may have just been coincidence that it worked fine on another port. I may have a loose conection inside the hard case. It has the banana plug set up on it, and I have the banana plug to deans plug adapter on it.

So along those same lines as you suggested, if for whatever reason I have a momentary open on my battery, it could act the same way as a switch problem. The other battery should be here today or tomorrow, so I will test that theory before I cut the swicth wire and bypass it.