This happens to me periodically, as well. I call it "burn out." I generally take a couple weeks, or I'll only practice half as much for one week, see how I feel, and if I feel the same take another week off without touching the piano. I find that it gives my arms a break, too. Mainly, though, I go back feeling refreshed, and believe it not, very often my pieces will sound better. I think this happens because I look at them with a fresh perspective. Also the "expectation" factor is gone. When I practice every day I keep expecting myself to improve more and more and more, and it is frusterating if I hit a lull where nothing seems to be happening. When I come back from a break, I expect to have had a bit of a lapse, and the pressure of doing better and better is momentarily off. Then I play more relaxed like and my pieces sound really good even after the long break.
Another thing I noticed, that I alluded to briefly before is that my body gets tired sometimes and I don't even realize it needs a break. I remember last summer working my butt off to get the first mvmt. of the Pathetique ready for an exam along with a bunch of other pieces and it always seemed to just escape me technically. The runs were just so hard to nail. After the exam was over I took a break for a few days. Then I went back to record my repertoire (just a cheap tape, but I like to have a record of me playing my pieces that I've learned over the years). And you guessed, it. Runs - no problem. My fingers were just exhausted from continuous practicing and needed that small rest and my technique was much cleaner when I returned to the piano.
So I'd say, yes, if you really feel you need a break, then by all means, take one! If you're worried about getting back at it afterwards, I'd say that, that is less of a worry than potentially burning out completely!!
Also, don't know your circumstances, but I felt like quitting last summer, too. Piano had lost the charm it once had. I switched teachers that summer, and now I never want to stop playing! It's amazing the difference it can make. Fresh start, more motivation to practice (for the scary new teacher, hehe), most likely new repertoire, new ideas, new perspectives. I knew how to play the piano last summer and I thought I did an okay job of it, though I was never quite satisfied with how "good" I was. Now, not only do I know how to play the piano, but I've been taught how to make music and how music "works," and I am satisfied with how I play. And all's I did was switch teachers. I thought I knew the basics, but I didn't even know the half of it. I didn't know that I didn't know until after the switch. It totally helps that my new teacher doesn't put pressure on me like my old one used to, as well. If you have pressure from yourself and another person as well, it's enough to push anyone to madness!
Anyways, like I said, I don't know your circumstances, so take it or leave it
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Topic: Sometimes when you just don't care