good moring everyone

have two vs 9000s one has no fan in it the other has fan they both work but when we scan for channels it puts the channels in twice.also put extra fan in both to kept cool.i also put a switch 21 in and set up port 1 and 2 works.did reset factory.two or three time each and still does same thing.also notice that it does a scan of channels with out showing any channels then the second time round fill in.and help would be great.thanks wagie