Right now I'm also on one of those "down" times you describe, but I've grown used to them because it's not the first time it happens to me.
I think gaming is not a perpetual interest that retains the same level of investment across time. You have ups and downs and it all relates to your interest in the games that are out or upcoming, perhaps your personal life, and many other issues. It doesn't mean it'll last forever, it's just a small phase that you'll, probably, get out of once the circumstances change.
At least that's what happens to me. Usually I see a future release that I dig and suddenly my interest returns with a vengeance.