Kenmore fridge buzzing

Really don't see why you would need a dedicated circuit for your frig. Just about all of the inverter compressors pull about 1.5 amps tops. I can't tell by what your describing but it almost sounds like a bad compressor. Keep in mind I'm not looking at the frig so I am guessing. Maybe you could take off the back cover and when the noise starts you can pinpoint it further. They also start at a low speed so they don't have a large amperage draw on startup. Noise from an inverter compressor will require replacement. Good new is most are guaranteed for up to ten years. Bad news is labor is not. If it is not to far out of warranty call the manufacturer. A lot of times they will help up you out as well. We deal with this on a daily basis and most manufacturers want you to be happy.

Sears does not make any major appliances. I can see why you are stuck there. They can't offer you anything they can't provide. Another manufacturer builds it for them. Wish I could be more help. If you can find out who makes your current frig it might be better to contact a service company that works on that manufacturers product. They have acess to a lot more information then a tech that is not factory authorized.