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As the box fan is a simple electronic, I would take the fan apart and check the solder points. If one has broken loose or is cracked, simply re-solder the point. Test it and try again.
Another suggestion would be to go to your local hardware store and find some appropriate L-brackets to secure the fan to the sill while still maintaining the ability to remove it and close the window. A little human ingenuity can probably outsmart a cat. ;)
Probably requires cleaning- take the grille off, pull the blade free (most pull straight out- some have a pin/socket deal right behind the blades that need to be removed first) and clean out any gunk you may find inside. Be sure to unplug it first.
before replacing the blade, turn the shaft with your hands to see how it moves; you might want to grease it with an electricity friendly lube of your choice.
If it's still hard to turn, it may just be this fans time; box fans are cheap, and made cheap, and the wear-and-tear adds up.