I'd worry more about the flickering than the actual shutdown because of the power surges. I'm sure you are using a surge suppressor but they have their limits. I had a board fail in my Sim projector in June which the technician attributed to large surges. It may have been caused by the huge power demands during that very hot spell. A really good surge suppressor is cheap insurance and its worthwhile to know their specs. Call me cautious, nowadays I don't leave the projector on standby but shut the power off completely.

John