I may be sending it back for warranty service (more likely replacement). Last night, I connected it to a powered USB hub and got the behavior I have seen a couple of times from having the wall charger on a car inverter. The touchpad starts registering incorrectly. In portrait mode, trying to use a soft keyboard it will get extra characters that are usually on the same row. It was practically unusable right after it happened, but by this morning it was almost normal again (was still getting a few extra, but not as bad as before). I suspect that tonight it will probably be okay again. The input technology is "capacitive" which likely means there are capacitors involved; the only explanation I can think of for it stabilizing with time is a capacitor slowly dropping voltage after a spike.
Am I the only one that has seen this issue? I did some Googling and found this is a known issue with some noteboook touchpads, which are also capacitive.
Assuming it returns to normal, I may just have to accept that it can only be charged by clean wall power using the provided charger or from a computer (I have done that without trouble). But I am not sure; mine might be an anomaly. I would hate to go the trouble of trying to get warranty service only to find they all do this. I am not even sure how much luck I would have with service if the problem resolves itself in less time than it would take to get it to a service center. I will follow up later to verify whether or not it resolves again.
Other suggestion? I have looked at surge protectors that have USB outlets, but I don't know if that would help.