Toshiba hdd/dvd rd-xs24sb keeps freezing ???

Hello,Regarding the Toshiba HDD/DVD RD-XS24SB.I have had mine since April 2006, And a few weeks ago it started to freeze during recording sometimes 30sec or 2mins into the program.I have taken everything off the hdd done the re-formatting ect,A few times i have been able to record a film or eastenders,but tried to record dr who on saturday and it froze :( again, please help me if you can.
kind regards from Mollie