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If you are using Lightroom 6, then you can try turning off the Graphics Processor from the Lightroom preferences.
Go to Lightroom Preferences from the Edit menu
Click on Performance tab
Uncheck the Graphics Processor
Let us know if that helps.
I have the most recent version, however it just started doing that on 6 then now it's still doing it on the 6.6 version. When I send out my images to be edited I now use smart previews, could that be a reason for it? I've never had issues until I started outsourcing using smart previews/exporting catalog.
There seem to be some issues with 6.6.
You may want to roll back to 6.5.1. Here's how: How do I roll back to Lightroom 2015.1.1 or Lightroom 6.1.1? | The Lightroom Queen
Simply replace 6.1.1 with 6.5.1 in the guide.