Problem with 24" Coralife light

[Glennrf38]

OK so now here is a weird update.

Got home after work.
The PCs weren't working.
Took the fixture off the tank.
Plugged it back in and they worked.
Put it back on the tank and they worked.
If it goes the way it has been, they won't work tomorrow morning.
If they don't work in the morning, the only thing I can think of is that there is something loose and when I moved it off the tank, it connected.

But, I gave the fixture a shaking and they still work now.

This is weird.