yosemite has been, for me, the most stable OS since 10.6.8. am installing the 10.11 beta this weekend, so...will be interesting to compare. am expecting issues (this IS a beta), but looking forward to it to...
Sounds like a pretty big issue to me....I'm used to going for a month without a reboot - and then it's because I initiated it to install a software update or something.
Again, like all have said, it may night be right for everyone but its made my 2010 MacBook Pro useable again for coding, some Adobe stuff and the Affinity apps are running like a dream. Overall, I'm really impressed.