The receiver will go into stand by mode after 4 hours if not being used. But if the receiver is shuting down by itself and you have to reboot the system to turn it back on you might need to replace the hopper. Hope this helps
Check the settings for the Inactivity Standby mode. This is likely what is causing the trouble. Also, make sure it is plugged directly into the wall if possible as some surge suppressors and power strips can cause issues.
If nothing else works, try calling Customer Support at 18003333474. If it ends up that your unit is faulty, they will get you taken care of with a replacement.