AT&T H810 Group Message Limit to 10?

So I'm on G4 number 2.5 (Had the first one replaced and had the second one repaired). For a while, any group message that was larger than 10 people got split up into multiple groups. If I received a group message larger than 10 people, it would only show my a group message w/ 10 people, and then if anyone outside of those 10 people responded, it would start a new thread on my phone with only 10 people with some of the 10 people from the original thread. And if I responded to any of these multiple threads that resulted, it would only send to those 10 people in that specific thread, not the whole group.

Well, this eventually seemed to be resolved without any action done by me. I believe it was around the same time as the July update that added advance messaging. So I was happy.

...until my phone bootlooped in August soon after I downloaded the August 2 update. I sent it in for repairs, and had to rely on my old Galaxy S4 for a bit, and the problem came back. And then when I got my G4 back, I assumed it would behave just like it was before the update and bootloop.

Nope. Group messages are jacked up again.

Any suggestions? I contacted AT&T, and they said it's a limit on the phone. Since I wasn't really able to use my phone right after the update, I cannot verify whether the update added a limit to group sizes, and I haven't seen any documentation. I feel skeptical that they added a limit, and I'm pretty sure this is an AT&T problem, but I'm open for any and all suggestions. Well, within reason, I suppose.

Thanks!

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