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Exactly the same problem... And I tried with three different brand... (Vifocal, 9H, ...)
https://community.umidigi.com/forum.php?mod=attachment&aid=MzM5NXw3Y2VjZTVkM2I2Y2FlNTE2M2E4NmEwODA5ODQ1MzcwNHwxNzg0MDE2Mjk2&request=yes&_f=.jpg
https://community.umidigi.com/forum.php?mod=attachment&aid=MzM5Nnw3M2YzNDk1NThkY2E5Mzk5MzUxYjVhODgyYjY3YWVlYnwxNzg0MDE2Mjk2&request=yes&_f=.jpg
And again... Thank you Umi... 
I have ordered a new touch screen on AliExpress, because i have already broke my screen (if you have a crack in the glass, you loose your touch...)
I will test the 9H tempered glass on my new touch screen.
I keep you posted.
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