Who I have the same questioned this topic

My home does not have coverage by Verizon (no service does on top my mountain), I use the Samsung 3G Microcell to give my home and yard coverage.  As I drive down the mountain I gain coverage by Verizon LTE network.  The issue is that my Samsung S6 often will not reconnect with the data Network;   Verizon sent me a new Sim card and that enabled me to connect to basic phone service every time (no data).  3 or 4 days out of 7 right now I do not automatically reconnect to Verizon towers.   I can go to airplane mode and back and reconnect, but I want this happen automatically. I have done the Factory reset a few times and even had a new phone & new sim card shipped to me, but this keeps happening.  Do you think my microcell needs a firmware update?  I have looked on the Verizon site and do not find one.  Anything else?

It works fine as I drive and connects with new towers after I reset it the first time.  This really seems to be connected to my wifi at home or the Samsung 3G microcell.  I only  have this issue after I was home.