For not the first time, but the second, my anny cups froze. Took me 16 hrs to realize it as well. This is the newer, sealed speed cart, which is about four years old. I have absolutely no idea why or how it happens, but as soon as I brought it down, it started to spin freely again. Anyway, took the opportunity to CRC both the cups and vane as well, as it was quite stiff too. Now, the cups are free, spin at less than one mph, and the vane will move one degree in a two mph wind. Just like new! So, you may want to scrutinize your anny, and perhaps find that it is under performing.