AF1000 issues

So i'm having a few problems with my employer's AF1000 unit.
Basically it works great when first turned on, but after being on for between 4-6 hours, whether it's being used alot or not, one of two things happens...

1 - it gets stuck in a mode where the brightness is only about 20% of full brightness
or
2 - it gets stuck in a mode where it won't strike at all.

I just recently put a bran new HO lamp in it, so I don't think it's the lamp.

any ideas where to look?

Thanks

jeff
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