Why does the computer go to sleep?

Question

Windows

I ask for the help of the collective mind.
the situation is this:
I stood in the monoblock store, worked for more than a year, there were no questions. but about a month ago the devilry began to happen. Windows Media Player starts by itself and the computer goes to sleep. when you turn it on again, it works for about a minute and again the same garbage. When you disable the keyboard (only with a mouse) it works fine.
what they did: they
replaced the keyboard, they
replaced the mouse , they
replaced the monoblock with a nettop with a monik , they
installed a UPS,
the nettop worked fine for about a week, and it started again :(
this leapfrog starts from 17.00 - 17.30 and until the morning. in the morning and in the afternoon it works fine.

Answer 1

Lots of options:
In general, if a complete replacement of the equipment did not give anything, then the reason is in external conditions, for example, I once had a user who (who) turned on the computer by hammering the toe of the shoe into the button (the button naturally died)