Griff, I can't offer a solution, but my first D90 did the exact same thing once in a while. I never did figure out why, but (other than being a bit annoying) it never caused any problems.
If you do find out what causes it, I'd love to hear about it.
Regards,
Art Vigil
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Denver City, CO USA
'95 RRC SWB TWR Edition
'72 Series III 88" (Rita)
'97 D90SW #2426 (sold 3/05)
'95 D90ST #2620 (sold 10/01)
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