My iphone x auto turn off and not come back. Connect to computer is also no sign of connection to itune.

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

I had the same issue. Here's the fix that worked for me:

Press and release the Volume Up button.

Press and release the Volume Down button.

Press and hold the Side button. (It may take a minute to boot.)

Once you get the device on, check to see if there's a software update available. If so, install it immediately before the issue happens again.

Please help. How do i set iphone x to TURN OFF AUTOMATIC AT 10 pm every day?... NO music, nothing, just turn off automatic .... In bed time option i only see a way to put alarm and remind to go to sleep.... i do not want a remaind i just want iphone to complete turn off at 10 pm everyday.

Thank you very much for your kind attention.

Be sure you have it charged