Last night I recorded 'Relocation, relocation' from C4. When I viewed the recording it kept 'jumping', both sound and vision, but not 'blocking'. At the time of recording there was a gale blowing but it is the first time I have seen this happen. All my other recordings have been fine andIi checked both tuners by recording two programmes at the same time and they were fine. Could it be the weather or possibly the hard disk that is the problem?