sounds like a ballast. I dont know yet what the E90 has for ballast setup, but on my MINI the (BMW) Xenons have these damn French made ballasts that fail regularly and have those symptoms.
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E90 328i Sport & Prem // R52 MINI S JCW // X3 x35i
62 Mini Cooper 997 // 62 Vespa // Laphroaig 30-yr
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