The second monitor disappears Windows 10, what to do?

Question

Monitors

Hello
I have Windows 10 x64 just installed. All drivers are up to date and everything works correctly.
There is a video card Radeon R7 240, which has D-SUB and HDMI.
There is a regular computer monitor with D-SUB and there is a regular TV with HDMI.
The system normally detects two monitors. The computer monitor is set as the primary monitor, with the "Extend these monitors" option checked.
Problem: the TV randomly falls off, i.e. naturally disappears from the system. Even during operation (some video may be running on it at the moment). You go into the monitor settings, press the "Detect" button, the TV reappears and continues to work as if nothing had happened until the next disappearance.
With Windows 7 x64 everything worked like clockwork.
Firewood was demolished, put anew. Previous drivers have been tried.
HELP

Answer 1

Turn off automatic TV detection.

Answer 2

Check your HDMI cable. I had a similar crap with a long cable. I had to poke it to make the TV show up.