When the event hint pops up just ignore it and select "exit",the "do you want to shut down" message may be caused by your TV remote control interfering with the NVR, i found that happened to me with my previous TV remote,since i changed TV's and remotes it stopped happening.
Turn the TV off/on at the power button when you go to bed at night and get up in the morning.
If possible move the NVR to the side out of direct line of sight of the TV remote,if this is not possible you may have to put up with the TV remote trying to switch the NVR off. I used to put my hand in front of the NVR when switching the TV off or changing inputs.
You can disable the unlock pattern in the configuration menu, select "user" then select "edit" enable/disable unlock pattern