I thought about going automatic, but it's just as easy to do it manually. The only benefit I can see for using automatic for me as a small seller is, the buyer can't leave feedback from the time the case is open, as opposed to being able to leave feedback until it's closed when done manually. 

You can also be more flexible by staying manual. If you have a buyer who is buying something every day (via auction), after 4 days they're going to start getting cases opened against them if it's automatic, might get upset about it and stop buying. They may also panic and pay, then stop buying, when in actual fact, they were planning on continue to buy.

Definitely sounds to me like the OP has clicked yes when the Unpaid Assistant was offered. Usually it gets offered when you open a case manually.