I have MyQ garage door opener installed few days back. Today morning at 5am, it opened my garage itself. We were all scared that someone has gained access to our garage as none from home opened the garage.
Suggest to erase all learned remote transmitter from the opener and then add/learn only the remotes that you use. During setup/learn operations to the opener when setup/install, the opener may have inadvertently learned a neighbors remote control. Erasing all remote controls and then re-adding the ones you use should correct the issue. See the opener's manual for how to erase the remotes and how to add remotes.