Problems to change User (admin + company)

REPRODUCIBILITY (% or how often):
BUILD ID = OS VERSION (Settings > About product):
HARDWARE ( XA2,…):
UI LANGUAGE: German
REGRESSION: (compared to previous public release: Yes, No, ?):

DESCRIPTION:

Hello, i have the newest Sailfish version3.4.0.24
I was trying to install a 2nd user -called “company”
Sometimes it works fine to change user – other times i get only black screen.
I have to restart Phone.
If nothing works – i have to remove Sim Cards and start phone again without Sim Cards and then change user.

What can i do?