ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Microwave Ovens?

I've got a faulty Microwave, in the w/shop,
it will cook food OK, but, after a time, if used to defrost food, for more than 19 minutes on 10% power, it will reset itself, half-way through the programme and just stop.
I have checked all of the obvious faults, but I am at my wits end, with this one.
Can anyone else help me out?.