[Vroom]

Just get the code, it will tell you want caused it. The codes that cause that are pretty specific. I had the same thing happen with a bad gas pedal when one of the sensors had a intermittent flat spot. It'd drive fine and then randomly trigger the low power mode, restart and it drove fine for a while, then would fire again randomly. Quite obnoxious. New pedal and all has been good since.
There are lots of things that trigger that though.