Yesterday, my 2 S9's which I had set to a fixed difficulty, stopped doing the set difficulty, and TBF webpage says 65536 as does the mining status page of the S9's.  No matter what I set them at, it never changed on TBF.  Did something change yesterday?  I even set them for variable diff and left them overnight, no change this morning, still at 65536.  Just wondering if anyone else is having any issues.  Thanks.