In my kitchen I have a central light fixture that has three 35watt halogen spotlights. I have had no problems for over a year but now the bulbs will cut out for periods of time and then come back on again, this happens with all three but it appears to be at random when they cut out. It's been happening for a month now, I have changed a couple of the bulbs within the past four months. Could this be a problem with the units wiring?