[eedoga]

we recently started running into a similar problem. for us it was an alignment issue. the large sprocket attached to the arm was pulling out of alignment. That was why we added the two large brackets on the side. there is still too much play so we are adding a longer shaft when it comes in on Friday in the hopes that that will solve the problem. check the heck out of your alignment. Also I think when under strain the window motors can sort of bind up internally. It might be that you are overcoming the seasing.

finally I have heared that using some Electronic speed controllers makes the window motors unhappy. we are using a spike relay for each of these motors.