The above explanations are similar to what happened to me. I would look ARC's up on the internet and see if their are any suggestions you can do yourself. The basic problem is electricity is going from the electrical wire to a ground. This could be caused by the insulation being defective and the wire touching a metal stud. Other than that it could be the resistance in an electrical heater when it comes on. It could actually be the switch that turns on the heater and does not happen all the time.A motor starting could cause it.
I would try disconnecting everything on the circuit that you can an see what happens. If everything works then start reconnecting/turning on what you disconnected.
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