Had a second 4GB RPi4B die on me the other day - this time, it was the one running VRS.
They’re in Flirc cases and don’t get particularly hot so I suspect it was a faulty PSU as it exhibited the same problem (random reboots and hangs over a period of a couple of days) as the last one just before it died.
I destroyed the PSU and got a new one with the replacement Pi.
The first time I connected using VNC, the catchphrase that came up started with Beast Radar…
How spooky is that?