I have this keyboard (for PC), with a strange fault.
you can type normally then after a few seconds it stops responding in
certain parts - notably the top row of letters ISTR. I find that if
you type slowly, it is a bit more receptive. seems like there's some
kind of 'memory effect' going on.

I know normally this would be a no-brainer, as these aren't worth
repairing, but it's a nice 'clicky' one which responds well to the
touch when it works, so if it is something simple I'd have a go at a
fix..... any thoughts?
-B