Our four year old neutered male cat uses his litter box... most of the time, but other times he craps on the bathroom counter or in the laundry basket! His episodes are sporadic and unpredictable as well as gross! Why does he sometimes choose to take his business elsewhere, even if the litter box is spotless?

UM, I googled it... and here are a few reason why he's not using his litter box:
-He prefers the spots that he is using other then where the litter box is.
Or something may have made him dislike the box like a loud noise while using it.

You could try to add a new box in another spot. Sorry that's all I got, not much but hope it helps.