The only thing I can remotely equate to your problem is some sort of magnetic interference. I experienced this three times with three different tablet PC's.
The first was a compaq TC1000. The poroblem occured after upgrading to a faster HDD. The larger motor magnet in the spindle drive caused a postage stamp sized area on the digitizer to quit working. Adding more shielding sloved the problem. The second was similar on a fujitsu stylistic. Fujitsu actually fixed the problem by sending out a metallic sleeve for the hdd which again fixed the problem. The third issue was with a Toshiba M200 that periodically developed random cursor movement while I was at work. It turned out to be interference from the two MRI units in close proximity to where I was.
If you are on a military base and are close to a large magnetic source, such as a medical facility with an MRI or maybe a large power generator, that could be your problem.
Since you did a factory restore and the problem was not corrected, it is most likely that it is hardware related. It is possible that it could be a loose connector between the screen and the base. On two units, its possible but the probability is lower. I'd try a thrd one if possible.
David
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