I got the instructions from the Sky website. Basically, you put the box into standby and press and hold the back-up button until an image comes up on your TV screen telling you the download is about to start and could take up to 10 minutes. As I say, mine took 15. At the end of this process, the box automatically goes back into standby. You have to wait for at least four minutes, and then switch on again as normal. And, hey presto, the problem should be resolved! I still get the odd problem, but stopping whatever recorded programme I'm watching so it goes back to real time TV and then pressing "play" again normally fixes it. Hope this helps!!