ArcGIS Print Service Failing

[MT_JenAmes]

I have an EB application with a print map tool in it that has been failing regularly lately. There's a lot of weird conditions going on here so I'm going to bullet point all the scenarios:

• One computer we tested on had no issues printing
• One computer we tested on had issues where it wouldn't print, we'd try again, and it would print. Then trying a new map, it would print immediately. Then trying another new map, it'd take 2 or 3 tries before it prints.
• Two computers are failing almost every time. We found that sometimes it would help to try to print a map with zero layers visible, but that was a temporary fix.

For reference, we use the standard ArcGIS print service, and all the data in the map we're trying to print is either from our own ArcGIS Online hosted feature services, or a different organization's (our county government) server hosted parcel layer.

[MT_JenAmes]

Ok well, it seems CORS has no effect on maps not printing. The devtools shows the CORS error when the page is loaded, but doesn't show any error at all during the actual process of trying to print something. 

The map that the print tool runs off of has a bunch of groups of layers in it, and turning off one group seems to make the map print. Sometimes. Sometimes, it still throws an error. 

Really, it's the inconsistency of the errors that's making me want to punch a hole in my monitor.