S4 shuts down when mobile & away from wifi

[jam24u]

I have tried every setting on my Samsung S4 to get past this problem. Could it be as simple as my Verizon account not being recognized by them, or a mobile setting being the problem. My wife has the identical phone and she reports no issues when traveling. One symptom bothers me though.... when I attend church five blocks away, the phone keeps turning off/shutting down on its own no matter how many times I restart it, BUT... if I bring my factory charging system..... the phone stays on.. does not shut down. ..... Any ideas and advice would be most welcome.

 

[belodion]

Have you tried a temporary battery swap with your wife?

 

[jam24u]

Have you tried a temporary battery swap with your wife?

No, I haven't. But I did order other spare batteries to keep as spares for our longer trips. Essentially the same thing happens when I have replaced the batteries, but I usually just use the original battery.
P.S. .... Thanks for the quick response.

 

[B. Diddy]

Does this happen in Safe Mode as well? https://support.t-mobile.com/docs/DOC-27781

 

[jam24u]

Eeeee !!! Safe mode----- not sure what that is.... guess Id better search that out. I know what it is on my laptop... but the phone, doesnt seem to jog anything in my head.

 

[B. Diddy]

Safe Mode temporarily disables all 3rd party apps you installed. It can narrow the problem down to something you installed vs. something that was preinstalled on the phone.