What causes a problem with the hazard button?

some times its cause by turn signal fluid

I have the same car with the same problem. I found out that heat from dash and poor design of the hazard switch location cause the failure. There is a recall in the works for this, but not until 2005.

What's fluid got to do with it?

The hazard button is hardly used at all so after some times it sticks in position, try turning it on and off to try and free it.