I thought I was having EMI issues with my 800 as well. I wasn't getting chatter, but when I used pinpoint, occasionally the sound would just stick after I ran it over the target. I could hold the detector up, walk somewhere else, but no matter what I did, the tone would stay solid until I cleared it. Like I said it didn't happen that often, but enough to be irritating. I called Minelab customer service and a nice lady said, "no no no... that is not right send it in". She sent me a prepaid label, I sent it in and it was back within five days. I'm taking it out today to make sure it's fixed... we'll see!