Disable MMS/Texting over WiFi

Hola @LawnMower, Intermittent issues are the pits because temporary fixes make things seem fine and then they break again. One thing that I have seen with intermittent messaging issues for SMS or MMS is congestion in the "mailbox" rather than the network side. If the messaging app that you are using (messages on your phone or messages.google.com) has too many messages saved, new ones have a hard time finding a "place to sit." Restarting the phone will usually free up enough temporary memory to allow the messages that are pending to come in, but new ones are stopped at the door. MMS are larger files by nature and are usually the first to be affected. Have you had a chance to go through your messaging apps and delete as many messages as possible?