I have Wac "L" track installed in a cafe and the Par 20 bulbs are blowing at a very high rate. (This the first time I've installed WAC track so I'm not familiar with it). Has anyone had this happen and what could be the cause. The track is run on strutt which is suspended from the ceiling with treaded rod. It is fed by 12/2 w/gnd EMT. The track heads rotate into the track and appear to fit well. Any Ideas?