I have an HR24/500 and recently It freezes on my - sometimes while I'm watching it - and sometimes...when I go to turn the unit on. The only thing that fixes it - is I have to unplug it from the wall and it reboots - it doesn't reboot even if I hit the red button. Any thoughts what might be going on. Note - I have the sleep function turned off. I have an older HD-DRV think its the 100 - and have not had any problems with that. Thanks for any help and suggestions.