I had this on a replacement unit. A reset didn't help, it would register phantom touches even through the setup process. I sent it back for another replacement.
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I am coming into this discussion very late as I did not have this problem. But I start having this problem since last night. It was driving me crazy. Anyway I googled the problem and a lot and finally found a solution.
There is a firmware download from originally touch screen maker that provide touch screen for SPro3.
http://esupport.sony.com/US/p/swu-download.pl?mdl=SVF15N190X&upd_id=9338&os_group_id=27
Once the you have downloaded you will find a called Calib4.exe, please run it and don't touch the screen while it is running, once it is done the problem disappears.
I had the "yellow band" problem and later on, off and on "ghost touches". The ghost touches appeared more frequent and every time on the same spot, as well during setup. The screen went inresponsive, the mousecursor moved to the ghost spot.
Switching off touch (I could work with a mouse) "resolved" the problem. Sort of
.
Called Microsoft and got advise to update drivers, calibrate the screen and do a full reset, switch back to windows 8.1 (I was on 10 prerelease). Knowing that would be in vain (because I was sure it was a hardware related problem) I skipped advise and called my reseller (Paradigit in Holland).
Quit a familiar problem, they said, and definitely hardware related.
I send in my machine and got a new? one back (with the same serial number!). I don't know for sure if the machine was brand new, or if they just replaced the screen. The back of the machine was now scratchless, everything looked new. Just the same serialnumber.
My advice: replace the unit.