Yup. Sometimes I'll open up several threads on separate tabs so that I can browse through each of them without having to hit a link first. Inevitably, that's the day it works fine, and when I don't do it the next day, it's down again. But yeah. I just end up going to other sites in the meantime.
Worst thing is if I'm in the middle of typing out a reply and then hit preview or post. It's hit or miss whether I lose what I typed so sometimes I'll copy-paste it into word if I think quickly enough.