Black/Flickering Screen in Whatsapp / Jiayu S3-8.1-madOS2.1

During typing in whatsapp, sometime, the screen becomes black for a second or less. Touch screen continues to work correctly so when then screen turns on, I see what I typed during black screen. I use Swift keyboard but it happened even with default keyboard. Unluckily it's not so frequent, so I Can't reproduce it when I want. I'll try to capture a catlog next time. EDIT: today for a little while I saw lock screen while flickering EDIT2: today for a little while I saw previous screen. I selected a message in Tapatalk and set to modify, while writing I saw black screen than the previous screen where I selected the message to modify, than black again and then back to my "real" screen. Duration is about 1 second or a bit more, for all that cycle. I don't know anything about under the hood android but I can suppose it could be something about video buffer. It could explain even the problems with video playback

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