I have had constant problems for about 6 months. Messages take forever to send or don't send at all. Sometimes it helps to reboot my phone but not always. Sometimes I can turn off WiFi and the message will go through and sometimes not. Very sporadic. I contacted my carrier at least 10 times and they can find no reason for it. Talked to Comcast to see if it's a problem with wifi. They checked it several times and said that it works fine. Very aggravating ☹️