Why would a remote randomly stop working?

A remote can randomly stop working due to several common causes related to battery, programming, interference, and physical damage that interrupt signal to garage door opener or other device. The most common reason is dead or weak battery, as coin cell or AAA batteries last 2 to 5 years and when voltage drops, remote range decreases and eventually stops working, so replace battery. Remote may lose programming due to power outage, logic board reset, or accidentally pressing Learn button too long erasing memory, requiring reprogramming by pressing Learn button on opener and pressing remote within 30 seconds. Radio frequency interference from LED light bulbs installed in garage door opener that are not opener-rated can randomly block remote signal, as some LEDs emit interference at 300 to 400 MHz, so replace with approved bulbs. Physical damage from dropping remote, water exposure, or extreme temperatures can damage circuit board or button contacts, causing intermittent or complete failure. Buttons can wear out after years of pressing, causing poor contact. Antenna wire on opener motor unit that hangs down may be damaged or coiled, reducing range and making remote seem randomly failing. Lock mode engaged on wall console that disables remotes can be accidentally activated, indicated by blinking light, so hold lock button to unlock. For TV or other remotes, infrared sensor blocked or dirty can cause random failure, so clean sensor. On average, garage door remotes last 10 to 15 years, but heavy use shortens life and replacement costs 30 to 60 dollars.