My HP touchpad restarts on its own after a minute or so after I shut it down via the Device Info menu, as the POWER button doesnt do it for me (pressing the HOME + POWER does reset it however and then the shutdown in normal way works, until the next time when u turn it back on again and try to shutdown... same has to be done again...)

Also, has anyone figured out why the power button does not allow shutting down at times.. is this a hardware or software fault.