Roper washer not completing rinse cycle

Model no. RTW4340SQ0

Problem started a couple days ago. For the most part, the washer fills and agitates correctly, but once it hits the rinse cycle, the washer will sit there and fill and fill like it never reaches "full" but never move into the final spin cycle. We have tried different load sizes and different wash settings to no avail. Once we stop it and shift it into the spin cycle, it drains/spins fine. It just refuses to rinse fully.