How do I fix my garage door opener that stops working in hot weather?
I had this issue with a house and the root cause for me was sunlight interfering with the sensors.  It only happened in the summer for about 3 hours of the day when the sun was just right to overwhelm the light beam receiver.  My fix was a cardboard tube mounted around the receiver to provide addition sun light blocking so it could see the light emitter.  You can also try swapping the emitter and receiver.