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You may have picked up some gravel in the rear brakes. Does it happen every time you back up? Does the car act strangely when backing up, like it needs to work extra-hard to move? Does it happen when your foot is on the brake? When your foot is off the brake? Is one of your neighbors missing a cat?
Your ignition switch is going bad. The strange noise is the starter remaining engaged and locked to the flywheel. Your best bet is to have the starter tested at your local auto parts store, to deduce that it is not, in fact, your starter.
Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.
The unit is failing. Probably the megatron tube. IT can pass quickly or slowly. I had a Sharp that lasted about a month before conking out on me at a most in opportune time: Dinner for 8 and it was late! Take caution. Start shopping.