my car has a problem.. happen twice..

i retrofitted bixenons into my 02 325ci.. and i even flashed my obc at new century so the car can operate with it.. after about 2 weeks running on bixenons.. the driverside one blew out.. dunno what happen but to make a long story short its covered by warranty and so assael got a new one.. that one didn't work.. so i they ordered another one.. and i just got back from assael but the driverside xenon didn't work again.. it was on for like 3 secs then the light came on on the dash and the xenon wasn't on.. anyone know what's going on? don't tink the xenon is defective cuz it did come on for a couple of seconds.. any know?? need help tia