What's the deal with 3156 Lamps and/or S8 wedge base sockets? I've been having a terrible time with these things. Seems that I am constantly changing out burned out lamps and I can't seem to figure out if it is the lamps that are to blame or the sockets. Sometimes the plastic around the contacts on the lamp is melted giving me the impression that the socket is not tight enough which is causing arcing. Other times, the lamp is just black, I replace it and it burns out again in a couple of months. The voltage is correct. Doesn't happen to all of them, but it does happen enough to make me want to stop using them altogether. Any of you guys have similar problems with this type of lamp and/or socket?