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Liftmaster 8500 opening on its own

My garage door opened on its own the other day and I noticed some beeping from the opener itself and the yellow light on the door control was flashing on and off.  I assumed the button had gone bad and got a new control.  I switched it out and it seemed fine for about an hour then it did it again.  I then thought the wire going from the control to the opener itself was bad so I got new wire and hooked up the new control with that.  I got the same result, beeping with the yellow light flashing intermittently.  Is it the board in the opener itself? 
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