Breaker going bad?

Hi
I’ve got a strange electrical thing going on in my home today. All of a sudden my lights go dim and microwave shuts down, after 10-30 seconds they come back to normal. I believe it’s all on 1 breaker that I’m having this problem with. The breaker seems ok, it’s never tripped. I’ve tried flipping it on and off. It’s done it about 6 times today, never had a problem before. Does this sound like the breaker itself is to blame?

Were you using the microwave every time it happened?

Nope, not using microwave
Had an electrician out who determined
The issue is the line coming into the house. Totally without power now, but hopefully Connexus can get us back online tonight.