I used 18-pound TUF line on my Shimano Spiress, and line put a cut/groove into the plastic molding just before the roller. The line would then get stuck in that groove and not return to the bearing. Since then, Shimano has redesinged this section of the bale with metal instead of plastic. They may send you a free part (do a web search and call them) or you could get a new bale at a parts shop, such as Ollie Damons.