mobile

Hey guys, I have a HTC One M8 for T-Mobile, I rooted it about 4 months ago, and always ran kitkat 4.4.4, recently, i decided to try Lollipop. I am now running Lollipop 5.1 Resurrection Remix v5.4.0. However, I don't think the issue has to do with the ROM because this issue happened when I was running Kitkat as well. I have tried restoring to previous ROMS, wiping and re flashing the ROM and no luck. It is not the SMS app i use because i have tried multiple apps. I will send a text and the person will never get the text. Receiving texts i'm not so sure happens as much as the person not receiving the text i sent. This is really the only issue i am having. Any help? Some texts will send, some will not. This is VERY frustrating. Can anyone help??