BuffaloStance Hey thanks, I am using the stock messaging app because I prefer not to use any google apps if I can help it. The problem is I am being told to uninstall and remove Graphene OS from my phone by my carrier, Pure Talk USA. They claim Graphene OS is causing all these problems, and they claim there is no problem with the phone itself. Like most tech employees in big telecom, they're all idiots and know next to nothing. With that said, I have tried EVERYTHING and still, the problem persists. It doesn't seem to matter which text messaging app I use, I am unable to receive certain (and random) group messages. Some group messages do through, others don't. As I've said, it's completely random as far as I can tell.
I have enabled "all permissions" for the stock messaging app, but still, the problem persists. I have changed all types of settings in the phone, but nothing helps. Anything you can do, or resources you have, are great.