Allow us to lend a helping hand. Have you tried deleting some of your messages? When did this issue start happening?
Please make use that the software on your device is fully up to date. Try walking through some troubleshooting steps in our Troubleshoot and Resolve tool. Just select your device and the issue that you're experiencing.
We also recommend checking out this Forums post from a customer who was experiencing a similar issue. Thanks for reaching out to us.
Makaela, AT&T Community Specialist.
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