I have a 150 watt hps light on my deck that has a new bulb and all... Sometimes when you bump the deck hard above it or on its own it cuts off and takes a few min, but will come back on. I have changed the bulb thinking that might be the problem as it was for some of the other lights in the past, but didnt work this time. Any suggestions on what it might be or to check next? Thanks in advance.