Thanks.
I have been in touch with Terry Platt at SX and I agree - he's terrifically helpful.
I did the usual eliminations by swapping out power supplies, USB cables etc and the results were the same. So I grabbed an updates driver set and this seems to have solved the issue - although I had been using the same (older) driver set for the past 6 months without issues. Who can fathom the weird and wonderful ways of USB connectivity? Certainly not I.
Peter
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