1. Has anyone experienced the PLA cooling fan surging during operation. Up until today mine would run at a constant speed during a print. Now it surges up and down in speed while printing. It does not do it while waiting to print during preheat but once the job begins it starts this behavior. So far it doesn't seem to affect the print quality but it is strange to listen to its whine wandering up and down the scale.

2. Is there a programmatic way to turn this aux cooling fan on and off without using the keypad?