This sounds like you are not applying even pressure with the squeegee. This is common for new printers, because your left and right arm are not equal in strength. If you are right handed, it is likely that the ink is building-up on the left side. You probably start out pretty strong, especially in the morning, but your week side will get tired sooner. Then, your ink builds-up and prints start to look bad. If this is the case, try to hold the squeegee firm and make your stroke with your WHOLE BODY, with a kind of backward stepping motion. In addition, you could move your stronger hand more towards the middle of the squeegee to help compensate. You could also try a push stroke instead of a pull stroke.