I have 2 20 AMP circuits to my bathroom running off same circuit breaker. One circuit powers a ground fault receptacle and vanity lights.
Other circuit powers ceiling fan, ceiling fan light, a ground fault receptacle and shower light. This circuit goes on and off but GF or breaker do not kick off. Sometimes this circuit goes off completely. If I press test button on GF receptacle it pops off but I can not reset it. Only way I can reset it is to power off at breaker then power back on then reset GF. The vanity circuit has no problem. I have rerplaced GF on failing circuit also replace breaker.
Any help greatly appreciated.

I have 2 20 AMP circuits to my bathroom running off same circuit breaker. One circuit powers a ground fault receptacle and vanity lights.
Other circuit powers ceiling fan, ceiling fan light, a ground fault receptacle and shower light. This circuit goes on and off but GF or breaker do not kick off. Sometimes this circut goes off completly. If I press test button on GF receptacle it pops off but I can not reset it. Only way I can reset it is to power off at breaker then power back on then reset GF. The vanity circuit has no problem. I have rerplaced GF on failing circuit also replace breaker.
Any help greatly appreciated.
... a ground fault. Is the GFCI being used to protect the other circuits (fan, fan light, shower light) or are they separate? Try disconnecting the loads at the load (all 3 wires) one at a time to narrow down the problem. May be a neutral issue. May also be excessive moisture somewhere in the wiring. Is this circuit feeding some other branches that you may not be aware of?