Another update: tried the airplane mode/5g toggle, which seemed to work (although toggling the sim seems to bring it back for a couple minutes). Before I could lose it again I found the setting mentioned earlier to set the network manually (Network &...
Installed the Android 14 update today and immediately lost service (also ATT but on a plan). Restarted, removed the sim, went to the ATT store and got the sim card replaced but it was gone again within 10 minutes.