[4.4.0][4.3.0][XA2] Android mobile data stops working in some condition (not well defined)

REPRODUCIBILITY (% or how often): 100%
BUILD ID = OS VERSION (Settings > About product): 4.3.0, 4.4.0
HARDWARE (XA2, X10, X10 II, …): XA2
UI LANGUAGE:
REGRESSION: (compared to previous public release: Yes, No, ?): Yes

DESCRIPTION:

Every time I come out from work, Android apps cannot access mobile data. This happens after the phone has been connected to the workplace WLAN, which is a mesh WLAN with MAC-level access control requiring a one-time login to enable the device MAC.

PRECONDITIONS:

This only appears to happen in the above conditions, i. e. after accessing my workplace WLAN.

STEPS TO REPRODUCE:

  1. Come to my workplace.
  2. Get a login to the mobile phone WLAN.
  3. Stay some 8-9 hours at work.
  4. Get out and try to get mobile connectivity from an Android app.

EXPECTED RESULT:

Mobile data connection is working.

ACTUAL RESULT:

Mobile data connection does not work. Restarting Android support restores connection.