A superflare erupted from the sun in early December, and arrived around Christmas. This heavily damage power supply in the western hemisphere, shutting down the Matrix. This shutdown had drastic knock-on effects, as most automatic cars and drones got blasted with strong electromagnetic waves and no reference system anymore. While on the ground everything came to a halt, in the skyline of Frankfurt several dozens of fatal crashes occurred. Most from drones hitting a skyscraper, or even breaking into one and subsequently hitting someone unlucky enough to walk by. After a few weeks, power did get restored but the Matrix was still barely functional. The job losses and disruptions in the whole country triggered a small famine, including riots in the poorer parts of town.
It took almost two years for everything to return to what was then the new normal.