Group text alerts keep hiding themselves

Thanks for the suggestion. I deleted the group message thread this morning and started a new one with the same group. So far, so good. Yesterday I made it nearly 24 hours without the thread being muted, so I will monitor this until tomorrow and report back.

FWIW, a couple things:

• the problem does not appear to be related to synchronization with another device. It just occurs at random on my phone regardless of whether I've used the iPad.
• the now-deleted group message thread took up significantly more storage than any other thread on my phone -- like 5x more (lots of photos). If deleting the thread solves the problem, I wonder if this was the underlying cause.

Hide alerts is not enabled on the iPad. The muting happens only on my iPhone.

Restarting both devices did not resolve the issue. In fact, just a few minutes ago the group messages were muted on my phone. I un-muted them and then restarted the phone. Immediately after the restart, the thread was muted once again.

I find myself constantly checking the group message thread, finding it muted, and unmuting it. The problem is only happening to one group and seems to occur frequently and at random.

It's been 24 hours since I deleted the thread and created a new one, and the alerts have not been muted. It looks like this solved my problem. Thank you!