I'd have your cat checked by the vet first, to rule out any urinary problems.

I inherited my Dad's Littermate (way back when it first came out). I didn't like it because it made too much noise and my cats were also afraid of it.

Once the UTI has been ruled out, you're probably better off getting another litterbox. I know what a pain it can be, but that automatic litterbox will really be of no help if they don't use it.

Good luck and please keep us posted.