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First thing make sure the battery in the keypad is good. If this is not the case then your keypad is losing signal strength and will need to be replaced.
The most likely problem here is that your wall control is bad. I would disconnect the 2 wires going to it and I think you will find your remote works. Replace the wall control.
If you mean the wall control you just remove it from the wall and look at the back. You will see the small printed circuit board. If you mean the keypad, it is usually glued together. Check the battery.
It is related. One of the buttons on your wall control is the lock button and has a lock icon on it. Press and hold it for 3 seconds. The blinking should stop and your remote should now work.
Anytime a door opens and/or closes randomly or doesn’t work consistently I look for a smashed wire between the motor unit and the wall button.
If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal.
Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.
The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.
The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.
In your case the expansion of the wall in the afternoon may be enough to cause pressure on the wire to increase the problem – works in the morning but not the afternoon.
Also after you change the batteries you need to reprogram the remotes.
If you are sure the battery is good than it sound like the keypad is bad and needs to be replaced. With a 6+ year old operator I would suggest a wired keyless entry (Donino GD-1) so if the operator has to be replaced you can use the same keyless entry.
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