Seat twisting and binding?

The driver's seat on my husband's Z is twisting and binding when you try to move it forward or backwards. I have found by pushing up on the motor hard, I can get it to move. I have not been able to find any obstructions in the tracks. It used to move back-and-forth fine. It would just make that noise you hear in the beginning of the video. Now it doesn't want to move forward hardly at all which stinks because I like to drive this car from time to time. I'm very short. My husband is very tall. I have included the video below for reference. Please ignore the shoddy camera work at the beginning and the sound effects from me. Y'all know this is a small car.