[Dustincoc]

I think you just have bad sockets. After a while, the terminals in the sockets will burn out. The tiny sparks are what's called Arcing, that is what destroys the socket. Replace both the sockets and the lamps. Bad sockets spread like an infection in that a bad lamp causes a bad socket and a bad socket causes a bad lamp. Reusing those lamps would just lead to a new batch of bad sockets. BMI carries the complete TP22 socket for S4's for $17.75(Part#TP22H) according to my latest catalog.