S21 Connect to Network

I have 2 S 21's that both have a connection to network issue.  Leaving on 24/7 or on/off both phones need to be network reset.   This has been a week with this.

We are home, close to the tower and connection had never been a issue.

Checked both Sim cards.

All updates have been applied and kept current.   It just really seems odd that two phones acting the same way.

Could it be they are paid off?

Tried the phone help and all I go was "Here is how to Reset"

Could there be a security update issue update?