Clip the remote control onto a sun visor in the vehicle instead of a metal ash tray or metal dash board that can.
Garage door opener signal weak.
To isolate potential sources of interference turn the circuit breaker off to the garage and plug the garage door opener into an extension cord from another room.
Before installing the extension kit move any metallic objects that may obstruct the signal between the remote control.
Oftentimes when your garage door opener remote stops working it is because the remote transmitter has lost its signal with the motor.
Any electrical device can be the source of the problem.
On most of the newer garage door openers there is a little led light next to the learn button on the back of the opener.
Test the opener that has the poor range.
If the range improves then the interference is coming from a device in the garage.
Modern garage door openers are essentially small radios that operate at about 315mh and a few feet of extra distance can affect the signal.
If the bad opener suddenly has good range again then the other unit in your garage is causing rf interference.
If you watch that little light while you push the button on your remote you will see it flash.
Make sure that the antenna on the motor unit is hanging downward and is not damaged in any way.
It flashes because it s hearing the radio signal from your transmitter remote.