I am not too sure if u guys can help but here goes
At start my ac runs fine but then after a while it trips off and doesn't turn back on until the car is driven(meaning when in traffic). It needs to be driven for a while and then it will come on and off like normal(whether in traffic or not). It cools normal so i am figuring an electrical short somewhere like a relay or something since this steps up voltage to switch the compressor on.
Any help is appreciated.

if its not an electrical problem then..

1st is get a can of freon $3.99 and fill kit w/ gauge $18.99
check if its low,leaking,etc...gauge will tell

if not the problem..then it could be the clutch on your compressor.