Just noticed last night that when using the skip forward/reverse feature, that sometimes the picture is kind of pixelated......... Unit is a replacement 508 that I just received in the last couple of weeks. This doesn't happen all the time just on ocassion. Could I be "timing" it just right after a single push of the skip key, I notice that it isn't advanced far enough & I skip again. Could this be the key? Anyone else noticed this>