I have our H3 set to reboot nightly at 3am but most of the time at some point during the late morning or early afternoon then i will get the popup stating that the unit hasn't rebooted lately and it will do so in 60 seconds unless i cancel it. if i cancel it then eventually it will state that i can't stop the reboot and it will go ahead and do it. I dont know why it can't stick with the 3am reboot time that i set it for. we had this same issue with our H2, that it wouldn't stick with the preset reboot time. Is this a known problem? it really sucks if it's in the middle of recording a show and forces a reboot like that.