Only after I changed the channel, the repeater no longer crashes. The recommendation that I have found in any part of the Internet, has paid off. Since then everything goes. I watch movies and series about Amazon Prime in HD on our 55 inch LCD without any lag or crashes. I even had five episodes Breaking Bad seen in HD at a time without having had a representation problem. The repeater is a constant 4 beams (reinforced concrete ceiling between Fritz and Fritz repeater router) So for little money good device.