My Pixel 5A froze and then went black while using Facebook. It would not restart no matter what I did and I tried ALL the suggestions. Plugging it in to a charger did nothing, there was no sign it was receiving power. I also could not access phone files via a computer. After many attempts at holding the power button down (or power plus the volume down), I suddenly got the Google logo to appear, but it would just go away and the phone wouldn't boot. The appearance of the logo was totally random and would take many attempts to get it to show again. After a couple days the battery finally died to a point where when I pressed the power button I would see a flashing battery icon. Once this happened, the phone started to recognize being plugged in for charging again. After fully charging I tried to boot it again and got the Google logo but nothing more happened and I couldn't get the logo to display again. I put it back on the charger and came back a bit later and tried again, this time the phone booted but it froze once the home screen appeared. Finally, on the 3rd attempt, the phone booted and started working normally again. It was a frustrating few days and I've found no explanation of why this occurs but I've seen other posts linking it to the Facebook app.