Well I don't have any problem while doing other stuff with my computer, including mining Monero or other altcoins.
Dev, is the processor affinity chosen random? or is it locked?
I believe random, what a question. Will have to look into it to be 100%
Please do, I'm not getting it on my other quad core, but the I7 6700k is 4 real cores + 4 hyperthreading cores so that may be a limiting factor.
Tell me if you need some logs or whatever.