Galaxy S7 texting issues

[wittykitty]

Does anyone have the same problem as me? Every so often I get "Messages not delivered" appear in the notifications window, even when a text has successfully been sent. I know it's only a little issue, but it is bugging the hell out of me!!

I did try installing a new texting app, but even after I set it as default, the Samsung messaging app still received messages, so I uninstalled it.

Please can anyone help, it's really irritaing, on what is a lovely phone!