Are you on APS or something else?I don't know if it's because of the extended 100+ temps or what but power grid is being taxed far longer than it usually is this time of year and we've been having weird brown outs.
Power doesn't go out completely but it's like there's a significant drop in voltage. Lights pale then flicker on and off. The fridge light stays on but the compressor doesn't. The floor fans stay on but they only operate at about 1/4 of their normal speed. Things like that.
When it happens at night you can see lights going on and off all up and down the street, like the ending of the Twilight Zone episode, "The Monsters Are Due on Maple Street." Creepy.