Thanks for the responses so far.
I have been wondering how to investigate further what might be the cause of this behaviour, and am now thinking (via the process of elimination) that it must be some form of hardware breakdown.
I've installed NickelMenu (nice!) and am looking at seeing if there is some form of diagnostic / benchmark type of query that I can use to verify if it is a hardware issue - at least I'd know it was kaput then.
NiLuJe or geek1011 - any pointers on that approach?
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