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Liftmaster 823LM Stops Working

I purchased 2 of the 823's to replace the standard light switches in my garage so I can control them remotely.  When I first installed them, one did not work at all and the other took a few minutes before it seemed to start working fine.  The one that began to work synced up fine to the MyQ app and all the car transmitters and worked fine with all of them that evening.  The next day, suddenly it does not work at all either by the switch directly or any other method.  I had an electrician friend of mine check the wiring and it is all code and proper voltage, so something odd is happening with these switches.  Now I need two replacements.
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