wpengine

I have tried using better search on and off for months now. It works for a little while but soon starts showing no results for every search. I saw some posts that mentioned issues with wpengine, which is where we host our stie. Wondering if that could be it and if you have found anything out that might help? the site is http://www.devops.com

https://ww.wp.xz.cn/plugins/better-search/