went to use the tivo this morning and it was displaying "starting up"
its never turned off or put in standby
this continued for over 1/2 hour so i switched it off and on ... got the usuall "starting up" screen but after over ten minutes got a green screen "the dvr has detected a serious problem and is now attempting to fix it....blah blah"
eventually after an hour all started working fine again for about 5 minutes until it hung then restarted itself
Sorry to hear this has happened with your replacement box and a warm welcome to the community.
If you haven't already had this issue resolved I would like to take a look into this for you but I'll need to gain access to your account to be able to do this. If you click on the purple envelope at the top right of your screen you will see a message waiting for you requesting further information.