Volvo S80 2004 window issues

So on my Volvo now I have replaced the blue sliding blocks twice and each time the window keeps wait to lean forward witch brings the long side of the window coming out of track and wants to bind up ag the top witch before broke the window kinda like the window wants to go up a second or two longer the. It should . Was woundering if the regulator might be bad causing the window to lean forward?its also making like a clicking sound like the teeth are jumping or not full engaging on the regulator thanks again .