I think I may have isolated the issue on my end - it seems that Shift+Num Lock turns on the Mouse Keys feature.
It seems to be pretty easy to hit this key combo on my laptop since I'm always turning Num Lock on and off pending what I'm doing at the time and holding the Shift key
Luckily, it's a toggle, so you can hit it again and disable it again. I'm going to poke around to see if I can disable this key combo completely, but knowing that it's a toggle will save A LOT of hassle.
I think I may have isolated the issue on my end - it seems that Shift+Num Lock turns on the Mouse Keys feature.
It seems to be pretty easy to hit this key combo on my laptop since I'm always turning Num Lock on and off pending what I'm doing at the time and holding the Shift key
Luckily, it's a toggle, so you can hit it again and disable it again. I'm going to poke around to see if I can disable this key combo completely, but knowing that it's a toggle will save A LOT of hassle.