I am currently running FreeBSD 14.0-RELEASE on a ThinkPad T400.
I will often be using my device, when the WiFi will suddenly shut off. i3status reports that it's "down" and wifimgr is blank.
I've tried restarting all and any network-related daemons, to no avail, and wifimgr doesn't seem to be...
Sorry if this is a little choppy, I pieced together two different discussions I had on the mailinglist.
I currently have all the iwn options enabled(that im aware of) and built into the kernel.
In my /etc/rc.conf file I have
ifconfig_wlan0="-ht WPA SYNCDHCP"