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As you can see it is a third party app causing this problem, you will have to find out which app.
in the "safe mode" calls are not deactivating "do not disturb", in the normal mode the first call is deactivating function
the page: /t5/Xperia-Z3/Z3-Android-6-0-1-Update-Do-Not-Disturb-Will-Not-Stay-On/m-p/1156369#M34735 doesn't answer my problem, it's focused on the problem with facebook, thanks anyway
problem caused by "blokada polaczen" (calling block) program (made by AndroidRock), after closing program - there is no problem, I have written to the author of the program, no answer, I have written my opinion in Google Play and waiting for the answer
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