keyboard funny - loss of ")" character

This minor manifestation of my keyboard problems is particularly
puzzling. Whether it's connected with the other funnies, I don't know:
it doesn't seem to be correlated!

This one manifests as an inability to type the character ) [close round
bracket]. On my keyboard layout, it is the shifted 0 (zero) character.
[UK layout - though I think that's where it is on lots of others, such
as the default (US) one.] It is not a hardware fault: I can type a zero,
and I can use the shift keys with any other key where doing so produces
a different character (I think that's all keys).

I don't know what (if anything specific) starts it (the fault is always
absent after a reboot); I also don't know what stops it - after a while,
though it _may_ well be something I do rather than just random, I find I
can type ) again. I can paste a ) no problem [my signature contains at
least one, so finding one to copy's no problem), but obviously that's
tedious.

Has anyone else experienced this weird one? (Does anyone know what its
cause is?)

JPG
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