Why do I lose my desktop picture on external (2nd) monitor after going to sleep?

Sometimes, (not always) my 2nd monitor will not have a background picture - only gray - after waking up from sleep mode. Even going to System Prefs and selecting different picture, it will only stay gray. All other items that I drag to it or that were there when it went to sleep are fine, just the background picture is the problem. After restart, everything is OK.

Settings>Safari>Autofill>Names and Passwords>ON

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