Poker caters to my moody personality, so I don't think anything of it if I play 9-12 days in a row with 8+ hour sessions, then hardly play at all for a week. Sometimes I find I don't want to start playing... but once I start, I actually enjoy it. (pretty much how I feel about washing dishes, too)

If it's your job, then you gotta balance happiness with EV, but that's what everyone struggles with, job-wise.

If it's a hobby, then take a break when you're not feeling it. I mean, if it's not thrilling you, then there are better ways to spend your time. And if nothing's thrilling you, then why risk your BR?

It could also be seasonal depression.