Strangely, our garage door was opening all by itself, without us using our remote or key pad. This happened several times over a two-day period. We tried deleting the code and reentering a code but that didn't resolve the problem. We contacted Precision and a their very nice and knowledgeable technician, Derrick, was on the scene in a matter of hours. He performed a reboot which seemed to work. But moments later, a close neighbor drove by. To our surprise, our garage door once again seemingly opened all by itself. The mystery started to be solved when Derrick asked us to check with the neighbor who had just opened her garage door. It turned out that our neighbor's car was in the shop for repair and she was given a "loaner" that had a remote. When she used her remote to open her garage door, she unwittingly opened ours as well. Mystery solved. Derrick reset our garage door opener so as to block the interference. Thanks goes again to "detective" Derrick.