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Question: Monitors are doing strange things

I'm running an iMac with a Thunderbolt 2nd Monitor. A wonderful setup until recently (I think about the time I upgraded to High Sierra. Problems began when the Thunderbolt monitor would go blank. I would get it back by unplugging the power cord, then plug it back in. More recently, when I turn on my iMac in the morning, both monitors are blank. I get them to come back after two or three restarts. Today, one screen covered both monitors, but no Dock or menus at the top. Getting concerned. Could this be a High Sierra problem?

IMAC (RETINA 5K, 27-INCH, LATE 2015), macOS High Sierra (10.13.1)

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User profile for user: Roger J

Question: Monitors are doing strange things