Texts can be going through fine, but then a series of mine -- like two or three -- get stuck. Yet while they are stuck 'sending', I still receive texts. If I reboot, some of them will go, but usually one or so is still 'unsent'. Using Moto G4 Plus. Vancouver Island. Full data, text and LD plan.
You can try reseating your sim card and restarting your phone. If that doesn't help can you try using another messaging app to send sms's and see if the problem continues? If it does, you can send a private message to Koodo via Facebook Messenger or DM via Twitter to see if there's anything they ca. Do on their end.