My pixel 5 has started randomly rebooting and gets stuck in the reboot mode (screen where graphene is loaded and you have the option to click power to pause loading). The phone will keep trying to load for several minutes and after many reboots it will finally load, with a message saying kernel crashed.
This first happened a few weeks back and then it seemed to be ok for a few weeks until it forced me to reboot and update. Now it is happening again

Is this a known issue (perhaps with an update) or is it likely something I have done to my phone?

a month later

I can confirm this issue. It is still persistent and happens after updating the Pixel 5. This occured around 2 months ago for me.
Unfortunately the Pixel runs in kind of a infinite boot loop until I wildly press the power and volume button which enables it to correctly boot.