Question about galaxy ballast

[wil0311]

One of my 250 watt MH lights is acting up. I have a sunlight supply 72" light fixture with the 3 250 watt bulbs and 4 t5 actinic bulbs. I have the 250 watt galaxy electronic ballast (one dual and one single) units.

Anyways the last few days the lights come on as normal with the timer and then about 10 min later one of the lights go off. It stays off for 10 min and then fires back up. It did this twice this morning and then stays on for the rest of the day. Has anyone else had any experience with this or could give me some advice on how to fix it? Thanks.