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Microsoft Windows 10 (64-bit)

How to remove strong interference from the Samsung Smart HD LED TV screen when connected via the Screen Mirroring app on a Samsung Galaxy A40 smartphone. The TV is from 2013 and the smartphone is from 2019.
When I open the Windows 10 TV and open the Windows 10 PC, the TV screen gets a strong "smear" interference"? How to get rid of it? I have a network managed by the main operator in our house.
I use a Technicolor cable modem on my computer, which uses a hybrid bandwidth with wireless and cable modem together?
I tried with a Samsung advisor to use the TV without the modem and the programmes work fine. But with the previous option I can't take advantage of the Wi-Fi connection which is important for a pensioner? Can you give any help?


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