i have been having the same problem lately. I even noticed some blue smoke coming out of my exhaust. When i changed my oil this is what i found: WTF is this in my oil?
It ended up being the little spring on the end of my valve seals. So i'm going to replace the valve seals this week and i'll see what that does. Sounds like you might have the same problem. I would change my oil and see if you find the same spring. Good luck!!