Weird PC problem for your delectation

[Chips]

Could just get a £5 keyboard to test your theory with I have an MS one I got just to plug into various Raspberry Pi's for initial setups where applicable. Perfectly good keyboard.

Mechanical ones are expensive, they require some force in comparison to a little office one - but I think I could dispatch large animals with a crack around the head, and still type up the email admitting my crime afterwards... However, they may not be for everyone. I wouldn't go back, but having said that, use normal keyboards at work. Find it much easier to type on my mechanical one but that may be my bias

However, I wouldn't spend north of £100 to test a theory.

[Redvers Ganderpoke]

I've seen dodgy RAM do that sort of thing before.

[pjknibbs]

Could just get a £5 keyboard to test your theory with

Definitely this. You don't want to spend loads on a new keyboard only to find it doesn't actually fix the problem, and USB keyboards are cheap.

[RegisterMe]

Agreed. And it will provide me with a "spare" should I end up deciding to get a "proper" one.

[RegisterMe]

The cheap as chips keyboard arrived on Friday and I've not had a single problem since, so that's good news. Now I just need to figure out which "proper" keyboard to buy .

[birdtable]

Nice to get a cheap solution to a frustrating problem ,, as for a "proper" keyboard like beauty is very much in the eye of the beholder.
Would stick with the cheap one and remedy what faults you find with the "proper" one ....