I had similar issues with the 47LB650V, Magic Remote & new Sky HD 2TB and Samsung amp but no issues with old Sky HD box and that combination. I finally discovered that the new Sky Box has an HDMI control option that appeared to be to clashing with Simplink, turned this off and now am able to control TV, amp and Sky HD 2Tb box via remote and Simplink with no freezing or slowing down of control.