You do not want to put #12 wire on higher than a 20amp breaker. You are either drawing too much current or there is a loose connection on the breaker & heating the breaker or the breaker is bad.
I am on the VA line outside of Roxboro, NC.
This has been a long process to this point mostly due to weather. The package arrived in June & the delivery truck could not get up my driveway so all the materials ended up across the street @ my neighbors house. The backhoe for grading broke down...