Have a look at this:
There seems to be an issue with bulb contacts corroding. This gives intermittent bulb failure messages.
http://forums.m3cutters.co.uk/showthread.php?t=35302
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E92 M3, Jerez Black, Fox Red Novillo, 19'' M Double Spoke, folding mirrors, lumbar support, front seat heating, PDC, USB, DAB, EDC, Bluetooth, Logic 7, High Gloss Shadowline, big smile