Difficult to show ticket to ignorant ticket workers in low reception

Convenient for purchasing tickets and good UI/UX but bad for when your ticket gets checked in the middle of a tunnel ride with no reception. Apparently the ticket-checking workers have not been informed about the obvious lack of reception in a dark tunnel affecting the ability to load my ticket on this app! Patience from the ticket workers would be nice. (I got a rude lecture and loud sigh from the ticket worker who was annoyed and didnt understand why she needed to wait a few seconds for my ticket to load in the tunnel between Visp and Bern.) Also, while for security purposes having to sign-in every time I use the app is understandable, its frustrating in situations above. They should have a feature that keeps you signed in unless a person deliberately logs out.

E12abeth L. about SBB Mobile, v5.3