71 Duster Headlight issues

The headlight switch has a breaker built in. Does this happen on both high and low beam?

Bad connections at the headlight connector
Bad/ going bad switch breaker
Bad connections at the dimmer switch
Bad connections at the firewall connector (one beam only)
And of course the ground normally out at the rad support

Frankly, since this seems to repeat, I'd go for a bad breaker of bad connection at the switch which causes heating of the breaker