Hey there, im sure this is an easy one and my ears may hear it differently hence my search didnt find what i was looking for.

The car makes a squeak noise similar to crickets mainly in idle, going real slow ie stuck behind slow moving traffic, sometimes wwhen taking off but it doesnt seem to involve the clutch, accelerator or brake.
At maccas the other day it made it as i pulled up to place order and it continued as i went to next window and continued again as i went forward and waited. Once i was off and on open road it was fine and didnt seem to make noise.
Has done it occassionally going over some humps too. It just seems to be erratic and i cant pin down exactly whats happening at the time to cause it?? Any ideas??