AVS Special Member
Join Date: Nov 2002
Location: Delmarva Peninsula, Maryland
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I think if the OP turns the breaker off that powers his gear, he will perhaps discover other receptacles, lights and or appliances that are running off of the same breaker. If he doesn't want to pay for a dedicated circuit, he might be able to isolate some things by plugging them in other receptacles.
Sometimes this problem is outside...before the circuit breaker box, and the local power company should check this for safety. If it checks out okay then he could have a loose wire at the box, which should be checked out by an electrician. If the box appears okay, including a loose breaker check, the electrician can go further into and throughout the home.
I hope the OP responds after turning off the subject breaker to see what other things are running along with it. Sometimes during the peak hot summer season, I get a slight and quick dimming of a couple lights as the heat pump kicks in. I always thought this was reasonably normal.