I have noticed that when I am moving from an SD channel to a HD channel, I get a message informing me that I am not getting a satellite signal, error code 25. This message remains on screen for about 3-4 seconds with a blue background, then the programme comes through and is fine. If I change channels from HD channel to another HD channel it is fine. The same if I move from an HD channel to an SD channel, no problems at all. However if I go from SD to HD, I get the message error code 25 every time. I have reset the box and this used to clear the problem. However that does not work anymore. Checked the dish, seems okay, signal strength, around 75, signal quality around 90. Can anyone kindly help? Thanks in advance.