Every 622 that is in standby mode over night "reboots" to updat info. If you are not shutting off the unit over night then what maybe happening is that if you are using it a 3 in the AM then go to bed. It will go into stand by mode 4 hrs later. When it goes into stand by it will reboot at that point. So if at 3 or so you have just switched channels it is very possible that it will reboot a 8 am. There is a setting that is called inactivity standby that is set in your menus. It can be set for 4,5,6,or 8 hrs. It is possible that this may hve something to do with when yours is rebooting in the morn. If it has been set for say 8 hrs then if you stop watching at midnight it would be doing it's reboot at 8 am.