If swapping another known working SIM card into this phone doesn't resolve the issue, there's potentially multiple causes for this.
I'm curious, do you find that you're on EXT a lot at your home location? It's possible that this is either a hardware issue, a local tower issue or your access has been limited due to using EXT more than 50% of the time.
Regardless, we can investigate this matter for you in full. Feel free to send a private message to @CommunityHelps so we can assist you further. For more information on how our Private Messaging system works, you can find out more here.
No I have never been on EXT at home. I'm pretty sure it's a local tower issue but it doesn't seem like there's been any movement as I created two cases and one of them was closed without them notifying what they did but it didn't resolve the issue.
I have PMed but at this point I'm willing to try anything but I would rather not wipe especially when it seems to be only 1 tower and getting frustrating when I'm not able to use my phone especially at home.