
Restart Messenger and try using it to see if it works.

Though, the cache allows your apps to store some data temporarily, which makes them run faster and use few resources you should clear it when it's causing the Messenger app to malfunction. The “Facebook Messenger down” issue might happen if the cache file is corrupted or getting out of hand. Relaunch it after that to see if it works, or keep going.

Tap on Restart and wait for your phone to reboot.
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Better still, you can make use of the traditional Android method long-press the Power key until you see the power menu. In case you're not familiar with this, you can restart your phone by long-pressing the power key for about 8-10 seconds. Just as sleeping or taking a nap resets your brain, restarting your phone resets the phone memory and can fix some problems along with it. Restarting your phone has been trusted for years as a remedy to many problems on a smartphone. Make a Reservation 10 Ways to Fix Messenger Not Working 1.
