I have the Pixel 6.
I started having the same issues after the 5th of November update.
My device would suddenly shutdown whenever I go outside, when I investigated the issue, it seemed like whenever I'm using 5G network, the phone would crash.
I tried to find logs, but sadly it's hard to do without adb (afaik).
I was able to replicate the issue by turning Wi-Fi off, restarting the device, then as soon as I put in the PIN, I use any app the uses data, the device would instantly turn off.
I later found out that whenever that happens, the lower portion of the device (right behind the fingerprint reader) would get extremely hot.
It might be worth mentioning that I charged the device using USB type C through my USB PC ports (which is not problematic as I use it to charge other devices)
At last, the device could not connect to my carrier network AT ALL (not being able to receive calls, etc) so I sent it for RMA