I have noticed recently that there is an intermittent problem with my saw after depressing the start buttom. At times it won't start running and I have to continue pushing the start button until it comes on. This morning I haven't been able to get it to run at all. I have checked the switch and the low voltage box to see if there is debris in them (both are clean as can be). In fact, the switch is only about 1 yerar old. Does anyone have any ideas