Forget about your neighbors confusing your code. That won't happen. Heat can always be a problem but it seems strange your problem runs between 3:00 and 6:00. Have you added anything new inside your garage that might be on during this time? Some things that use wall warts (little plug in transformers) have caused interference. If you have added anything new try unplugging it. Even inside your house.

Thanks Don for your response. I do not recall any new items, but I will discuss it with my husband.

It happened again today at 3:30. It's daily now, whereas 2-3 weeks ago it was only 1-2 times a week--yet was able to get door to close usually with several attempts of pressing car remote. I said temp was 104, it was 107 and we are burning up--thank God for a/c.

A little more details of current situation:
The door starts to move and then will return, there is no one level--it can stop almost immediately or be half-way to near the end and it will return to full open position.

I notice that if I am successful at closing the door (after numerous attempts waiting 15-20 seconds to press car remote again) I usually have to back up approx. 20-30ft. for the door to finally close if it will--it does about half the time.

Thanks again. If more detail info. rings a bell to others problems, please respond.

If the door starts to close and then reverses to the open position it is most likely the sensors in the doorway. Make sure they are pointed directly at one another and the small light on each one is on and not blinking. If it is blinking you must get real close to see it. Tweak them until it no longer blinks. The other thing you can try is to increase the 'down force' just a tad. The 'down force' control is located near where all those white wires go. Don't overdo it as it affects the safety.