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On my ex-e39 I know when the bulb sockets started getting corroded, one would get similar symptoms.
Just pull the bulbs out and gently clean with a fine grit sandpaper - I'm 99.99% sure this will cure the issue.
Some guys were using non-OEM bulbs, and the socket material/coating was bad giving similar symptoms.
0.02
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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.
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