IMEI & SIM ICCID Drops Off AT&T Network?

Does anyone else have this issue? I own my own Samsung phones and just pay for monthly SIM service.  It seems that every 6 months the device which is registered to my AT&T account drops off from being authenticated from AT&T's networks. I can make outbound calls but no one can hear me. I can receive SMS but not send.  No LTE or 5G services work, I get a great signal but no IP address to use the data services.  On my account, when I sign in there is no device displayed under My Device there is a icon with a "?" in it.  I usually see my phone photo, model#. 

I have to call in, provide my IMEI, Model# & SIM ICCID (which is AT&Ts) all over again, reboot and I am back on the network.  This happened with my S20 Ultra 5G and now my S22 Ultra.  Only this time around I could not find anyone else which understands the issue to fix it.  After 4 people - they told me there is a state wide outage or update going on and they would get my issue looked at.  There is no state wide outage or update.  My AT&T straight talk phone works just fine.