I have to reset my screen resolution every hour.?

This happens once every hour all the time I am using the pc. My monitor goes black, comes back on and everything works great for an hour, after I reset the screen resolutions.
Update: The times my monitor goes off and on are 5:57-6;57-7;57 8:57 Day and night. The screen resolution sets to the lowest at 6:43, 9:43 and so on. My monitor works ok between these times.
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