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Intermittent operation can be caused by a door interlock micro switch, a weak capacitor, an intermittent wiring connection from heat or poor connection, a marginally performing diode or a sticking Magnetron. Except for the Magnetron all other repairs would be worth the expense.
Repair costs and parts for most everything else will be between $65 and $100.00 depending on the part(s) replaced. Replacing the Magnetron would cost more than 50 % of the total unit replacement cost.
check for any holes in the microwave, then also checkplugs/electrical. if ALL this doesn't work.. then you probably need a new microwave, or return the microwave to the shop, saying that it is a manufacturer fault.
Trust me, many microwaves have done this.