Sony Xperia Z2 LTE tablet mobile connection stop working after incoming call

After incoming call to a tablet mobile data connection stop working at all. There is no connection to packet switched network, no icons of LTE/H(SDPA)/E(DGE).
Only software recovery or  factory reset can help to solve this problem.
Obviously, it;s a bug of a ROM.
ROM 17.1.1.A.0.402, Model SGP521

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I suggest that you try to repair the phone software using PC Companion..
Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?
If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.
 - Official Sony Xperia Support Staff
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If you want to get in touch with the local support team for your country please visit our contact page.

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