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Knocking/banging sound on compressor start up. when the compressor starts up the fridge will make

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when the compressor starts up the fridge will make a knocking sound like someone knocking on wood or the front door. the knocking is of differing intervals and happens only on compressor start up, and not shut down.i have had technicians out several times to evaluate the problem, and it is always the issue of it not doing it while the tech is there. during the one time the tech was there and it made the noise, he dismissed it as "normal function."i have owned a fridge or two in my life and do not accept this as normal function. the knocking is so loud it will wake us up at night.some observations:1. it seems to happen more at night than daytime. perhaps this is just due to fact that there is less ambient noise at night - but it really seems worse at night. However, i have been noticing it at all times of the day now. 2. i feel it has something to do with the freon at start up of the compressor - but this is just my supposition.3. the fridge was laid down flat when it was being carried into the house. i remember way back when someone telling me never to lay something down flat. could that be part of cause for this issue?i am giving up on factory help, please assist me in being able to fix myself. Thanks, Todd.Our almost new Performa Whirlpool refrig makes a knocking sound a number of times a day. It is no esthetic problem, but I want to be sure it is not interfering with the operation and lifetime of the refrig.

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