Anyone know if the Nikon D100 has a history of problems?

Occasionally (most recently Wednesday night), I will be using my camera, press the shutter release and nothing will happen. This "intermittent failure" will go on for a few minutes and then everything is back to normal?

Any ideas on what's going on here?

I heard a nasty rumor that any repair of a D series camera at Nikon costs $500 and up.

If there is a website that might be better suited to this question, I would appreciate a referral.