Suddenly the Samsung messaging app will not send messages to other Samsung phones. The message shows on my end as failed. I have no issues sending messages to an iPhone.
In order to attempted to resend a failed message to another Samsung I have to reboot my phone everytime.
Are you using the pre-installed messaging app that came on your phone?
Have you tried a third-party messaging app to see if you still experience this symptom?
You can try clearing the cache in the app to see if that helps any.
Navigate to your settings > apps > find and click on Messages > storage > clear cache.
Yes, I am referring to the app that came loaded on the phone. I have cleared the cache and followed the trouble shooting suggestions on line but there still seems to be issues. I have tried WhatsApp but not everyone uses this app so I still have to revert back.