Panasonic DMR-E65 Power down when Finalising Disk?

Hi, After it completes a recording my DMR-E65 will instantly power down then restart if I try to perform any disk mangment function - e.g. finalising or titling the just reorded disk. Also does same thing when writing to disk at end of a recording. Is this a known fault and is there a cure? Grateful for any help I can get!

Dave
February 2009