wall electrical outlet is clicking - why is it making this noise?

[nova2]

there is this wall electrical outlet near a sink and it is making these clearly audible clicking noises every 1 or 2 minutes (but i have heard happen in less than 60 seconds),
there is another one in the bathroom of the same kind (has a tiny integrated light inside the outlet)
and it also makes these clicking noises.
They do not make any noise when the breaker on the outlet is tripped.
It is not a buzzing sound.

I have a light plugged into one and it seems to function normally.
it does not seem to flicker when the clicking noise occures.

why is it making this noise?

is there also any chance of a fire hazard?

 

[nova2]

my suspicions seem to be right about them being screwed
http://answers.yahoo.com/quest...=20070901191052AABhChM
http://malaysia.answers.yahoo....=20080120175614AACNmtS

 

[Modelworks]

Its probably not a fire hazard, but it could be losing some of its effectiveness.
Those outlets are GFCI.
Designed to trip if you should be using a hair dryer in the bathroom and drop it into the sink or bathtub.

You can replace them fairly cheaply, about 10.00 each.

 

[WoodButcher]

Replace them. I had a box of 10 bought at Home Depot did the same thing. 4 diff homes, every gfi from the same box of 10. I did not disassemble or investigate , just tossed and replaced. It doesn't matter what's wrong with something like that, it simply isn't worth the risk.