99% an ignitor issue. I'd try swapping ignitor from left to right.
You can replace the ignitor individually with an OEM peice, or replace the ballast/ignitor assembly with an aftermarket one that will be PnP into your D2S housing.
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Hot: 2001 Estoril M Roadster
ZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's michelin supersports, deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
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