I'm having an issue with my TA03 diff. When I first assemble it, the thing feels great. Its very very smooth after twisting it a few times but then starts to "grind" and then smooths back out and starts to grind again. When I first built it, it did this so I thought possibly debris, I cleaned it and started over. Same thing. I put ceramic balls in it. Same thing. Do I have a defective part somewhere in this thing?