I wonder if the moving parts inside are dusty or lightly locked from dirt. If it were me, because I love opening stuff and seeing how they work, I would open and take a look. I have no education on what I am seeing...LOL... but I can't remember how many times I "fixed" something because I could tell something came loose or just needed a little TLC. After all, if it doesn't work before I open it and doesn't after, I am no worse off. Of course, after checking the cord/plug and all that. There may even be a video somewhere on youtube or something that addresses it.