I have been running CC 15.05 on V1 for almost a week without any mods - no crashes or hangups, however I don't have hardware to push it to max. Android phones and tablets are the only ones using wifi at my place, and although they are capable of high link level speeds, they are tuned in a way which causes relatively miserable "real world" transfer speeds, i.e. using samba.
After reading this thread for a while, I want to share some ideas.
I suppose lots of people here are using fan scripts. In addition to that, they can try lowering transmission power to levels suitable to their environment. Just walk around your place with client device and check transfer rates, find the lowest power setting which still works ok - anything higher is just a heat.
It attracts attention how some of us are having pretty good experience with OpenWRT on this device, and how some of us get crashes multiple times a day. What is the difference? Configuration, client, devices, environment, network traffic? I think, unless we find a deterministic way to reproduce a crash, nothing will be fixed regarding that. So, "lucky" guys with multiple crashes a day, tell as much as you can about your devices, network and etc.
The 2nd interesting thing I noticed, it seems lots of you are using PPPoE, VLANS, and basically have to deal with MTU<>1500. Could it be the difference between users who have frequent crashes and users who do not?