Divi and WordFence Issues

I have Divi & WordFence installed on 50+ sites and until recently without a problem. Since an update however while I’m working on a page, out of no where preview pages keep popping up and when I try to save the page I get a failed to save error. When I disable WordPress the problem is resolved. I’ve contacted Elegant themes and they referred me to my host who in turn referred me back to Elegant themes (neither could tell me what was actually causing the problem) so I’m hoping that I can find a solution here.
There are quite a number of people on Divi forums experiencing the same problem (but absolutely not all.) I’m pretty sure that the problem started when ET introduced the New Divi Experience.
TIA