Touchscreen AND touchpad fail when the power is plugged in

[natb19]

This seems to have started very recently (last couple of days - hard to say as I use it on battery a lot) that when I plug the power cable in, the touchpad and touchscreen accuracy gets flushed down the toilet. The cursor skips, phantom clicks up to 4 inches away (you can see then in the Win10 UI) when dragging and just moving around. 

This had me baffled until I'd read in some bug reports that the touchpad can be affected by the touchscreen, and I know that touchscreens are sensitive to external charge (happened on an old android convertible I had years ago).

Unplugging the power INSTANTLY solves the issue, and as a further test, just touching the metal on the power cable to the aluminium case also triggers the problem.

So I can only conclude that there is some power leak from the charge/power unit onto the laptop case.

Anyone else seen this happen?

[natb19]

Now, also had a problem with my wifi dropping fairly regularly yesterday, and ONLY my HP Envy - my other devices were fine.

After some research, I rolled back the wifi driver and it solved the wifi dropping problem.

I'll have to confirm, but it also seems to have solved my touchpad/touchscreen problem!?

Happy, but very confused! lol