Help Galaxy s4 mini loses connection, thinks it's roaming

[trjm]

Hi all -

I wonder if anyone can help me out with this. I'm using a Galaxy S4 mini GT 19195, Android 4.4.2.

Every day my train goes through a network black-out area. The phone then decides that I have left my home network and that I don't have connectivity because I'm roaming. I get the "You have lost data connectivity because you have left your home network without turning on data roaming" message. An exclamation mark sits at the top left corner of the screen.

Usually the phone re-establishes a connection a few minutes later. But today it has not done so, and I have no idea how to get the connectivity back. I've wiped the cache partition but this has had no effect.

Any ideas on how to proceed?

Thank you!

 

[Dngrsone]

What I do with my S4 is to go into Settings, go to the More... tab, scroll down to Update, and Update PRL and then Update Account.