My Polaris 380 just goes in a wide counter clockwise circle in the deep end of my inground gunite pool. Never ventures to the rest of the pool.

Last year I purchased the tune up kit and replaced all parts including a broken belt. This year, it wont go in the shallow end unless I drag it there. I have read the troubleshooting in the manual and adjusted the thrust jet, ect. It doesnt help. Any ideas?