I have a ecosys 6535cidn that when printing from the main tray (making copies or printing from the network.) will pause after 2 or 3 pages exit the machine. It continues to spool as if it were re calibrating or adding toner but no message states that is what it is doing. It will come out of the multi purpose tray fine. It never jams. I have checked the sensors they all seem fine. I have tried a new feed drive assembly, kyocera suggested a main board that did not help. Ive tried a new black dv as it happens with both color and black and white. Ive tried the fuser even. Any suggestions on this would be very appreciated.