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Also going out on a limb here, but have found it to be quite common with electrical failures. Check the neutral (white) wires on the buss bar inside the main breaker box. The wires are screwed down to the buss bar and quite often these screws are loose or work loose over time. If you have one loose, that circuit will fail and sometimes work depending on whether a connection is made again. A sure sign is darkening of the white insulation near the buss strip. Check all the screws on that buss strip to make certain they are tight. You might also want to check the ground buss bar as well. I suggest disconnecting from the power post before working inside the breaker panel.
Let us know what you find.
Good luck.
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