Today, after a few days worried about this ****, my pixel 3 has dead in the same circunstances. During the morning at around 1 pm, screen goes black, and only can connect pc and read "QUSB..."
Tried to contact Google support, tried scalated to tier 2 support, and only get "Send to repair to Google" (431€ in my case), and nothing more, out of warranty and goodbye.
Was thinking about get a pixel 6 (i keep a nexus 5 working till the days), and was planing to keep this pixel 3, but now i don't know what phone buy, but this makes me think: NOT A GOOGLE PHONE.