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888lm opening random

888lm connected to liftmaster 2500.  Also installed liftmaster 8500 connected to another 888lm.  The liftmaster 2500 opens randomly, even when all codes have been erased and even when the 888lm is "locked".  Suspecting a bad unit, I swapped the 888lm's and the same problems occurred.  I also tried "locking the liftmaster 2500 with its original wall controller, then installing the 888lm with no luck. Also cleared all the codes on the liftmaster 2500.  This cannot be "phantom opening" due to someone else's door opener.  This is ridiculus.
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