I get like that sometimes. When I do, I just get more strict with my diet and training. The potential is there, I just need to provide the right stimulus. If I'm not seeing results, it's because I'm not doing everything that I should be. Oh, and I always try to read some new stuff too. If I find something that sounds pretty awesome that I can try in the gym, then that will get me motivated. Sometimes (rarely), a new supplement will get me motivated although I've pretty much given up on that lately. If you're able to, add a little variety to your workout...it is the spice of life, after all.