I was actually in a situation similar to you. Lost of interest in learning new stuff, every thing feeling the same as something that I already know, and obviously I was wrong, but it took sometime before I was hocked over a new subject I know little about. Lately, I'm studying Computer Related skills like soundness, proof assistant and automatic proof/solver. It will not have any impact on my IT career, but I never learned anything for my career.
I keep working on myself too.