I am not sure it will help at all, but my observations on this issue are as follows…
When our family was on Verizon I could not use ip banning because of this very problem. To make it even more of a pain, 90% of the time I could not connect if on mobile service at all. It seemed to me that if I was in my “home” cell, within a few miles of my house it would work much more often. I could trick it into working by connecting with wireguard and then disconnecting wireguard and cell would work for a while.
All of the crap ended when I moved my kids to ATT wireless, well ended for them and location updates became much more regular as well as sensor updates when on cell. In short, my wife and I switched to ATT as well and all of the problems are now gone. I now have ip ban running and have not seen the HA Companion app fail to connect in weeks!
This problem had plagued me for years! Over several phones and fresh installs of HA and Companion. I do not know what Verizon was doing to the data, but it was seriously broken.