I solved it among with a few other problems too...

One of the bulbs is almost burnt out. It's some Taiwanese bulb (no offence) so I replaced that.

The problem, I think lies in the left taillight cables. A few of the cables were exposed!!! yikes... so I just taped 'em and I haven't been able to repeat the problem...
so all is good.

Thanks!

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2008 BMW 335i Coupe