07-15-2014, 10:49 AM
With my Vario it has happened a couple of times but it was more of a case of the microbeast being too wet or dry,(which happened alot with a velcro head Challenger/cotton pads as they age and wetness.) Once it was the actual levelness of the floor. another thing I noticed is keeping an eye on pressure of the head.....With the spring arm set up,depending how you "handle' the unit-lifting up on or pushing down on the handle too much either way changes the balance/pressure on the head which in turn can allow for the bunching as well.