https://wccftech.com/google-pixel-3a-xl-random-shutdowns/

Let us just say that in terms of smooth smartphone launches, Google wouldn’t take the top spot. With the company’s Pixel 3 lineup suffering from numerous software-related issues shortly after their official release in the market, the more affordable Pixel 3a and Pixel 3a XL have been giving some trouble to users as well. It would become a frustrating experience if a mobile phone would just randomly power off, especially if there is an emergency, and unfortunately, that’s exactly what has been happening.

A new Reddit thread was initiated by u/Ravoz, detailing how random shutdowns have been happening on both the Pixel 3a and Pixel 3a XL. The post states that these phones simply power off without warning, and it requires a hard rest of around 30 seconds before they start working properly.