Just an update - the problem got progressively more severe over days. So
I ordered a new keyboard and replaced it. The issue has now gone. So it
looks like this was a hardware issue. I have marked this bug report as
invalid.
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1922766
Title:
UP and DOWN keys behave erratically
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