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I advice you to contact service if it has guarantee. This seems to be a psychological problem about your oven(!). Technical person need to do an electronic research surgery on its board to see if there is any wrong thing.
Sounds as if it may be getting hot look at the back and under the unit there will be a grid of sorts sometimes at the back and//or the bottom or side/s of the machine check to see if this is free of dust etc if not clean and try again remember microwaves can give a nasty bite//please switch off and unplug first..
I have Kenmore microwave model 721.61820100. It has an "Option" button. Press it. The display say "NUMBER" Then press "1". The display should say "SOUND" and then "OFF". Press "Start" and that beast turns silent, well not really, but the beeps are goooone.
If for some reason you don't like it this way repeat the sequence and the sound this time will turn "ON".
Your keypad or control board may have moisture or grease on them, but your keypad (membrane switch) is likely going bad.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find a keypad (if available) by entering your exact model here: http://www.samsungparts.com/search/search.asp