I have been using this sander for several years without any problems. In the past week of use I can no longer get a good finish with it. I am getting swirl marks and other patterns. I am using 150 and 180 grit Granat. I even bought a new pad since it was getting worn out. I have tried different suction settings and nothing makes a difference. Here are a few examples of what I am seeing. Any ideas? Thanks -Kevin

