So far in our testing on two sites, this issue has been resolved in the source tree in GIT. I am running two source-built YAF sites from that revision in GIT and they so far have stabilized on that issue.
I will look to see what revision I have and post it here. Additionally, if you need a built copy of that version, I can zip one up for you. It is a beta, and by all technical definitions, not for production servers, BUT - I've run beta versions of YAF for about 4 years now and when you get the right revision from GIT, they are perfect to run on --
If you can't find it using the forum search, try my signature link -- searches this site using Google:
Google is my Friend