Generally speaking, updates remove bugs, but in the case of Google's 2016 Pixel XL, a new problem was introduced with the Android 8.1 update this January. When charging in certain circumstances, the OG Pixel XL will (dangerously) attempt to pull up to 40% more current than it has negotiated from the charger, repeatedly entering and leaving a charging state as the charger shuts off due to overcurrent protection. So if you've noticed your Pixel XL recently flashing "charging rapidly" multiple times after being plugged into the stock charger, that's why. 

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