I have my 15x in my office for months with no issues... Over the weekend we added a new desktop computer to the array of systems here ( now 3 desktops and 1 laptop). whe I turned on the 15x today I got a lot of interference..so i went through a whole set of solutions.. (outside antenna, different power circuit) what i discovered was that when my laptop is unplugged from the network via CAT 5 the horrible noise disappeared.. but still some distortion and interference a couple channels when the new system was powered. What i am wondering is what could be the problem and why the worst interference is when a "connection" that has been in effect forever is causing that problem... is there a way to get rid of the issue. Thanks for your help