My LG microwave

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I had an over the oven LG installed 7 years ago. It has worked fine all these years but in the last few months I swear it's possessed. It will suddenly start humming like it wants to be cooking but its not, and nobody touched it. The turntable will be stationary, and the display that says things like cook or gives pm for the time will be out. The only way to stop it is to program a couple seconds of cook time and start, and when that finishes it goes off
Opening the door does not make a difference when its humming
I also think it doesn't cook as efficiently as it used to, Frozen meals are fine but raw potatoes seem to need a lot more time than they used to. This happens sporadically and never can tell what causes it. Replacement is not something we can afford and I am afraid that a repair call would be the cost of a replacement
its model LMV1630BB
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