should I unplug the Fire Stick when not using?

some folks have indicated that leaving the fire stick plugged in (even in sleep mode) could create problems later. assuming they
are concerned that an update might occur making kodi unusable?

is there any reason I should not leave the fire stick plugged into my tv and in sleep mode?
how do I turn off auto updates and is there any reason to enable it?
is there anyway to turn off (without unplugging from power source) the fire stick?