Lenovo P2 occasionally flickers black screen and sometimes becomes unresponsive - Lenovo P2 Questions & Answers

On Lenovo P2c72 i had the latest stock rom (firmware p2a42) and at some point the phone started occassionally flashing a black screen for half a second, sometimes the whole screen, sometimes the parts of the screen (full screen width, limited height-like a box), Then sometimes just freezing the touch screen to be unresponsive (side buttons were still responsive just fine like nothing is wrong).
It's having the latest P2a42 firmware and i just installed TWRP and LineageOS 16, but the problem is still the same. When i inserted the sim and rebooted, the screen became unresponsive, but when i took out the sim and rebooted, it was again responsive. The flickering happens anyway.
Can i do anything to fix it ?
I can test and reply, if you know of possible solution.

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sorry the bad english and thanks for the attention
--edit--
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