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Need logs to be able to tell you much. Get some output from dmesg after it happens, but before a reboot. Syslogs couldn't hurt. Maybe setting up a metrics exporter to another machine could give you a peek into what is happening with resources.
Also give some details about OS and what you're running on it.
Just happened again, no errors in the network manager log. I am running an up to date version of raspberry pi os. The only bare metal program I am running is pihole, the rest are in docker. I'll send a list of the containers when I can.
It's more important to get that dmesg output AFTER an event happens, but before a reboot. What you're running doesn't matter much unless you have live metrics of their behavior or resources.
I had a similar problem, it was caused by undervoltage. Are you using the official power supply?
Yes
How many and what kind of accesories do you have plugged into it?
Maybe a dumb question but what kind of case do you have? Hopefully not metal because I had some crazy wifi behavior before I realized the case was either dampening the signal or capturing too much noise.