When you turn the washer on the tub fills, then the motor starts and the agitator barely moves. if you push it down and twist it a little you can feel the motor trying to "catch" it and make it turn. When the machine goes in to the regular wash mode the agitator works normally. The machine goes through the whole cycle just like normal. Its' just right at the beginning when it's trying hard to get the clothes under water and even distributed in the tub that it doesnt want to move much. Can you help?