We have a C1+ that we bought in april - It seems to have 2 reoccuring problems - first, a black "toner spray" appearing on the operators side - not just during black runs - it comes and goes - the drum has been replace 3 times - the transfer belt 4 - the black developer housing 2 - Its back again - any ideas? second is a line on the edge of 13x19 stock - comes and goes - the tech comes out and cleans and it magically goes away until the next time I run 13x19 - once again any Ideas?