You can "dodge" the nightly reboot by adjusting your timer Menu+8+4 every day or 1.5 days. Just before it would reboot, you move it earlier. However, after several days your guide will be bad, the recorder will become unstable, and you may miss some recordings. Sorry, I don't recommend doing it for more than say 3 days.
You might want the bedroom reboot sometime in the afternoon to sleep well at night. If the guide is enough out of date, it may be reloaded anyway if you are away/asleep when it is detected. This is very likely when you access the latest times in the guide or do a search, maybe. Even with normal reboots, the recorder will occasionally freeze up, possibly from memory leaks.
My annoyance is that with recordings scheduled or even being viewed live or recorded, it will reboot.
-Ken