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Its quite a common problem (I've seen this on FIAT's & Ford's also). Usually the culprit is a bad earth or some wires making contact (that shouldn't). I would recommend that you look at the wiring in the offending light unit and test the various circuits (if the source of the problem isn't immediately apparent). Check also for signs of water damage, as this could also give rise to the same symptoms.
Hope this helps (sorry its a bit general, but there are quite a few different reasons why this may occur, and didn't want you missing any whilst investigating).
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Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater