Incoming calls are suppressed and a notification is missing

REPRODUCIBILITY (% or how often): Sometimes
BUILD ID: 3.3.0.16
HARDWARE (Jolla1, Tablet, XA2,…): XA2
UI LANGUAGE: English
REGRESSION: (compared to previous public release: Yes, No, ?): ?

DESCRIPTION:

This is a copy from https://together.jolla.com/question/215182/bug-incoming-calls-are-suppressed-and-a-notification-is-missing/?sort=votes&page=1

PRECONDITIONS:

Nothing special

STEPS TO REPRODUCE:

EXPECTED RESULT:

Phone calls should be working

ACTUAL RESULT:

Incoming calls are suppressed without a notification

ADDITIONAL INFORMATION:

Please let me know what kind of logs would be helpful