I have a Surface Pro 4 1724 that has recently started suffering from a phantom touch - a ghostly white circle at the bottom right of the screen as if the screen is being touched there:
The trackpad doesn't work and, whilst a USB mouse does, the cursor flickers unacceptably. I've followed the instructions here but they don't work; uninstalling the Surface Touch two HID - compliant touch screen options fixes the display corruption but obviously disables the touch screen. Rebooting the SP sees the problem return as the device reinstalls what I assume is buggy firmware.
I've reset the device a couple of times, formatting it and reinstalling Windows 10 (20H2) from a USB drive and whilst the problem is not present at first, after a number of updates are installed from Windows Update the problem recurs. I have a number of other SPs, all with 20H2 installed and none of them have this issue.
Can someone help please?