Your dish might be a little out of track... After you do the auto go out and have someone stay inside to watch the signal strenght and grab the bottom of dish and lift up, and down a little and see if your strenght changes much... Also you might have some worn bushing if its fine on other sat but as it goes to east of west it flops some... Most of time if it has NOT had a tuneup, the ground can settle and raising the elevation ever so slight can make all the dif...