I have an old Salvo (now Light Monkey) HID light that has started randomly shutting off. Cycling the power switch has reliably worked to turn it back on, but sometimes it will fail again a minute or two later and other times it stays on for a long period. I'm thinking it is likely the toggle switch that is failing, but I wanted to see if that is potentially the ballast beginning to fail. All of the dives in question have been in Puget Sound (currently about 53 degrees), so I don't think it would be heat related, but who knows...