Are you sure it is the litterbox and not the litter?
Did this suddenly start up or has it always been that way?
Did you change the litter type? litterbox location?
Cats are sensitive to even small changes that we might not even think about.
When I worked at PetSmart, we got the automatic ones returned a LOT so I am not a big fan of those. Plus, they only last 2-3 years (that coming from the customers who use them).
I've seen the one you linked to. It always cracked me up that is said it's "self-cleaning." It doesn't roll over on its own! lol It just seemed like a pain to me to have to roll it - and one more thing to clean (the grate). *shrug
As for the fountain - I had 2 Petmate fountains and I like them a lot... more importantly, the cats like them!
On one, the pump stopped working and I took it back to Petsmart and they exchanged it, but they gave me the wrong one - gave me the more expensive one, Drinkwell. I didn't realize it til I got it home so I figured I would try it out and see which I like better.
Whichever one you get, find the cheapest price online and print the page and take it to PetSmart and they will do a price match.