Wifi error log for Bookworm?

My Pi5 running bookworm has developed flaky WiFi behavior about
24 hours after the latest upgrade.

Where should I look for error messages? Nothing shows up on the
screen during negotiation, it appears that the Pi negotiates
for a minute or two and then gives up. Two red X's appear in
the Wifi entry in the top-right menu bar and that's it.

The only visible hint is that even if the connection is specified
at 2.4 GHz a wavemon window is left showing what appears to be a
5 GHz attempt. My access point doesn't support 5 GHz, making the
attempt, if it is one, appear to be a mistake.


The access point works with other devices, so I don't think it's
the problem.

Thanks for reading and any suggestions!

bob prohaska