I have a Panasonic full HD TV which was connected directly to the roof aerial cable = no problems with Freeview HD reception, picture, sound or channels. In order to be able to record programmes, I purchased a Humax 9150 T twin tuner. I connected the aerial cable to the Humax and then connected the Humax to the TV with an HDMI cable. I now have problems with the picture and sound " freezing and jumping " on certain channels - especially ITV - and this makes it impossible to view those channels. Has anyone else experienced this problem and/or does anyone have any idea how I overcome it ?