If the recording on the hard drive is giving sound breakdown it is either a reception problem or a tuner problem. Putting that recording onto a DVD will only give the same result as the act of burning the DVD cannot improve the signal. Has this just recently happened? Are you in an area that is going through the change to digital? Try an aerial booster to improve your signal and check alignment of your aerial.

There are often differences in the sensitivity of tuners so it may be that the Panasonic needs a stronger signal than the TV. If that is not the case then it seems as if the tuner on the Panasonic has developed a fault. Does it affect all channels that you record, or just specific channels? Try a re-tune on all channels to see if that has any effect.

Before you take it for a repair estimate I would unplug all connections and make certain that they are clean before plugging back in. Corrosion and dirt build up on terminals can cause poor signals. Then do a complete re-tune on the Panasonic. If that does not cure it then you will be looking for a repairer but I have no idea what they would charge. Currently Richer Sounds have new ones available for £210 so bear that in mind when you get a quote for repair. It might be worth getting a new one if the cost of repair is too great. Panasonic at R.S.