I'm having a similar problem. I'm not recieving texts when they are sent, it sometimes takes hours to get some. It's intermittent, texts work fine most of the time.
I have a galaxy note 3 and have used the stock sms program and Verizon messenger app as well. I was running old kit Kat android and have tried upgrading to lollipop to no avail. I did a factory reset as well. It has been an issue for 3 months. Happens mainly in group texts but now single person ones as well.
I want to make sure you can always rely on your text messages. We appreciate all the troubleshooitng you have completed. Typically after a factory reset the device should restore back to normal working order. When you completed the reset, how soon after did you have the issue again? Do you get any error messages when this occurs?
YareliM_VZW Follow us on Twitter @VZWSupport If my response answered your question please click the �Correct Answer� button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!