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.
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's supersports, ZHP knob, UUC short shift GROM, OEM 18's w310's,
http://absolutehid.ca hid kit