arch fault breakers keep tripping...

[Robert D.]

Would you know why ARCH fault breakers keep tripping ? they trip over night, property is vacant. Nobody is switching on/off anything so there is no way the “arch” is the problem. Always the same breakers trip. My electrician told me that it is because comed delivers power in a way that is “not consistent” and that’s why the breakers on the same phase trip. I don’t buy that…is it because i have that hocuc pocus mikey mouse temp connection outside at the mast ? the socket outside is rated for 60amps...the panel is 100 amps..