I'm not sure if it has already been mentioned in this thread but I had a weird problem with a customer's T100 which has been bugging the hell out of me, basically when working in windows you will loose focus of the app you are in almost like you are clicking somewhere else on the screen or that the touch screen has a ghost input. It seems this was due to using a different USB to Micro USB cable when running it on mains, after swapping in the original (very short) USB to MicroUSB cable the problem went away.
I hope this helps anyone else having similar issues.