Logik LDVR808 DVD Recorder freezes?

My DVD recorder has frozen during a recording for 2nd time. Can't switch off, can't do anything. Last time unplugged it then it restarted but had to go back to original settings and reset time, date etc and timer recordings. It is connected to a security camera and that is the only timed recording on the unit. That is its main function although do play the odd dvd on it. Why does it freeze and what can I do to repair it?