I replaced the motor and thermostat on my attic exhaust fan. Its working however the fan seems to turn on and off much more frequently than it should. Sometimes it will turn on and run for a couple of hours and other time it will run for a few minutes and shut off, then turn back on in a minute or two. Maybe I got a bad thermostat...? Was going to try to replace the thermostat again and see what happens. Any recommendations would be much appreciated. Thank you in advance!