I'm getting some more weird behaviour from my Mums laptop I'm trying to fix. Sometimes it's like shift gets stuck on, even on the on-screen keyboard, nothing I do can turn it off. When this happens you can't type numbers or some characters like full stop.

I have noticed that the left shift key doesn't work.  Likely related? I find it weird that the on screen keyboard is showing both shift keys on.

Other times it's like the function key has gotten stuck on.

Memtest comes back ok, I ran HCI for a couple of hours ok. I'll run windows memory diagnostics some time. Prime95 testing pi generation for an hour worked fine too. It has a new SSD in it.

Any thoughts?