Weird ignintion problem that is intermittent

[Ashman]

Sometimes when I turn my key to the start position, I get a click, but the starter does not engage. then I turn off the ignition and turn it back on and it starts up just fine.

So my question is, does this sound like a switch issue, a starter relay or a starter issue?

Should I just wait until something stops working?

What could I do to check to see what the issue is? I will call my mechanic and ask him, but I thought that perhaps someone here has had this happen and knows what the issue was.

Car is a 1992 300CE With M104 24V Engine..

Alon