Hi @Alen1, sorry to hear about this. 
I have translated your question to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Are there any error messages in the device? For example that the System UI has stopped working?
If that is the case, try restarting your device in safe mode and see if you experience the same behaviour.
Let me know how it goes! 
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