The most recent beta-test CeroWrt (version 3.10.48-2) is working very well. The incidence of the wifi-related bug #442 has dropped, and it otherwise has been stable for almost two weeks. Get it from http://snapon.lab.bufferbloat.net/~cero2/cerowrt/wndr/3.10.48-2/
There is a newer version - 3.10.50-1 - that has not been well tested, but it incorporates another wifi bug-fix. If it checks out, this may be close to a release candidate.