Chamberlain Liftmaster Professional Remote Light 395lm "eye flashes" Questions

...be blocking them, or there could be a build up of cobwebs in the opening for the electronic eye.  Typically when the light flashes it is indicating that somehow the infared beam is ...

I have a Miracle One gate opener and, as I've done a hundred times previously without incident, I clicked remote to leave gate partially open (to take trash cans out), about 20 seconds later, the gate

The door goes partially down then back up. The lights flash. What can I do to fix this? It will go all the way down if I hold the button for the duration. check your safety photo eyes are lined up. ...