Mobile network stops internet connection now and then

REPRODUCIBILITY (% or how often): since the upgrade to 3.4
BUILD ID = OS VERSION (Settings > About product): 3.4.0.24
HARDWARE (Jolla1, Tablet, XA2,…): XA2
UI LANGUAGE:english
REGRESSION: (compared to previous public release: Yes, No, ?): yes

DESCRIPTION:
while mobile network is on it loose the internet connection and come back again after a while

PRECONDITIONS:

STEPS TO REPRODUCE:

  1. mobile network on
  2. internet dissapears by it self
  3. come back the internet connection after a while

EXPECTED RESULT:
The internetconnection should keep with internet whille is on

ACTUAL RESULT:
the internet is loose some times

ADDITIONAL INFORMATION:

(Please ALWAYS attach relevant data such as logs, screenshots, etc…)