Anyone ever had any issues with one?

I shot sporting clays (charity deal) the other day with a guy that had a relatively new one. The bolt kept sticking open. I am not very familiar with them - we took it apart, and the "action bar" was sticking in the rear of the receiver. Cleaned it out as best we could, reassembled and it shot fine for 20-30 rounds then starting sticking again.

My thought was some fine sandpaper and polish the edges of the action bar wear it slides in the receiver.

Anyone else had a similar issue?