Not a bulb issue as the same bulbs are used elsewhere on 6Na. When the switch is 1% to 100% the lights are 100% on and pop off when switched to 0% when on reverse phase, ie do not dim 100% on at any dim level. Change to forward phase and the lights do not function at all. I'm thinking a wiring issue as affect 4 out of 20+ switches and the four are in a single area, any ideas?