Odd Engine fan behavior

[Jprps]

Truck is a 2011 prostar with a cummins. So sometimes my fan will "creep back on" and sometimes its fine. Like the fan will kick off or I will kick the manual override off, then after about 10 -15 seconds the fan kinda creeps back on. sometimes at like half go or 3/4 go. So then I flip the manual override on and the rest of the fan power returns. If i go to turn the manual override off immediately the fan wont turn off, if I give it a couple seconds of run time then flip it off, it will turn off for 10 - 15 seconds and creep back on.

It seems like It only does it sometimes, other times its fine. Also when the fan creeps back on and I don't intervene by manually turning on the fan, I can start to hear a squeaky belt noise or like a squeaky pulley noise of sorts. Any Ideas?