when recording some channels start to skip'' help''
 

on my freeview box when i record something some channels start to'' jump skip'' its abount 5or 6 channels. the channels are freeeview 16.23.30 4&5 some times. i have done all the normal things like turning on and off. leaving it switched off for a while. done a manual.auto. first time search.nothing works.got a ''wharfedale twin turner dvr. had it abount 4 years. is there anything i can do .or is it to do with the switch over thank you for any help.