I took the SX out in the snow today and it was shifting fine going up and down through all the gears. Then after awhile when I shifted down the shifter stayed down and I had to gently pull it back up with my foot. I hopped off and cleared anything on or around the shifter and away I went. I shifted down again and as before it just stayed down. so I took it back to the garage, pulled the shifter off and put some Penitrating oil on the shifting shaft (the piece that the shifter goes on). And it still sticks when I shift down but never if I'm goin up in gears. Do I need to adjust the clutch? Any Ideas?