ARC GIS Map Labels, operating for 6+ mo.s, now disappear when moving away from page or publishing

I have a PowerBI report that has 5 tabs/pages.  Each page has an ARC GIS map visual that shows a by-country breakdown of loan amounts by county, with color-ranges that show weighted average risk ratings (risk ratings from 1-8).  

The labels on my map show the total amount for loans within each county (in millions).  This report has worked without flaw for over six months.    

In the last month, when operating within this file, each time I switch from one tab to another, the labels disappear.  I have to enter the ARC GIS map options, re-enable the labels, and set them to the right data field to get them to display again.  However, when I save or publish, the page I've just corrected may save correctly, but the labels on every other page disappear.  If I leave the recently corrected page and return, the labels have disappeared, and need to be re-enabled in the ARC GIS map options.   

Does anyone have experience with this sudden error?