Most of my shutdown / crashes are from a much simpler scenario : come home, turn on the Theatre to one of the HDMi inputs (usually the set top cable box), and at some point on its own accord, just by itself and with no recent BR1 button presses, everything just shuts down.
The previous Sunday, it shutdown at 7.08pm, 7.15pm and 7.38pm.
No switching between HDMI inputs was involved.