Here are a few things you can check:
Fan Relay: Sometimes, the relay can cause intermittent issues. Try swapping the relay with another one in the fuse box (just make sure it’s the same type) to see if that resolves the issue.
Wiring and Connectors: Inspect the wiring and connectors around the fan motor for any signs of wear, corrosion, or loose connections. Sometimes, a simple disconnection and reconnection can help.
A/C Control Module: The control module might be having issues as well, especially if the fan behaves erratically. It could be worth getting it checked.
Blower Motor: If the blower motor is starting to fail, it could be causing the intermittent operation. If you feel comfortable doing so, you can test the motor directly for better insights.
Climate Control System: Make sure the settings on your climate control are all functioning correctly. Sometimes, a malfunction within the controls can cause what seems like a fan issue.