Lenovo T440 and some annoying messages on the console

[Kurt Buff - GSEC, GCIH]

Newly installed machine, connects to my wireless network at home fine
(I'm configuring it for the kids). I haven't installed anything on it
yet, beyond re-installing pkg and then installing synth, both from
from ports.

$ freebsd-version
12.1-RELEASE-p3

$ cat /etc/rc.conf
hostname="t440"
wlans_iwm0="wlan0"
ifconfig_wlan0="WPA DHCP"
sshd_enable="YES"
ntpdate_enable="YES"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"

But, I'm getting these same messages on the console, frequently (this
snippet comes from /var/log/messages, not the console, but you get the
idea). However, while these messages are being written, I can set do a
continuous ping to some random host, and it all works - until it
doesn't. Then, I have to do 'ifconfig wlan0 down' then 'ifconfig wlan0
up', then kill dhclient, and finally launch dhclient again with
'dhclient wlan0', and I'm back on line. It usually takes several hours
(overnight, and I've launched a ping, which has failed by morning).

If anyone has ideas on what's going on here, I'd love to hear it. My
Win10 laptop (Lenovo T470) doesn't seem to have this problem.

Kurt

Apr  8 22:26:39 t440 kernel: wlan0: link state changed to DOWN
Apr  8 22:26:39 t440 wpa_supplicant[652]: wlan0:
CTRL-EVENT-DISCONNECTED bssid=70:3a:d8:4c:0b:00 reason=0
Apr  8 22:26:39 t440 wpa_supplicant[652]: wlan0: Trying to associate
with 70:3a:d8:4c:0b:00 (SSID='5705NE197th-2.4' freq=2422 MHz)
Apr  8 22:26:39 t440 wpa_supplicant[652]: Failed to add supported
operating classes IE
Apr  8 22:26:39 t440 kernel: wlan0: link state changed to UP
Apr  8 22:26:39 t440 wpa_supplicant[652]: wlan0: Associated with
70:3a:d8:4c:0b:00
Apr  8 22:26:39 t440 dhclient[90380]: send_packet: No buffer space available
Apr  8 22:26:39 t440 wpa_supplicant[652]: wlan0: WPA: Key negotiation
completed with 70:3a:d8:4c:0b:00 [PTK=CCMP GTK=CCMP]
Apr  8 22:26:39 t440 wpa_supplicant[652]: wlan0: CTRL-EVENT-CONNECTED
- Connection to 70:3a:d8:4c:0b:00 completed [id=0 id_str=]
Apr  8 22:26:47 t440 dhclient[94495]: New IP Address (wlan0): 172.31.120.14
Apr  8 22:26:47 t440 dhclient[94496]: New Subnet Mask (wlan0): 255.255.255.0
Apr  8 22:26:47 t440 dhclient[94497]: New Broadcast Address (wlan0):
172.31.120.255
Apr  8 22:26:47 t440 dhclient[94498]: New Routers (wlan0): 172.31.120.1
Apr  8 22:41:17 t440 kernel: wlan0: link state changed to DOWN
Apr  8 22:41:17 t440 wpa_supplicant[652]: wlan0:
CTRL-EVENT-DISCONNECTED bssid=70:3a:d8:4c:0b:00 reason=0
Apr  8 22:41:17 t440 wpa_supplicant[652]: wlan0: Trying to associate
with 70:3a:d8:4c:0b:00 (SSID='5705NE197th-2.4' freq=2422 MHz)
Apr  8 22:41:17 t440 wpa_supplicant[652]: Failed to add supported
operating classes IE
Apr  8 22:41:17 t440 kernel: wlan0: link state changed to UP
Apr  8 22:41:17 t440 wpa_supplicant[652]: wlan0: Associated with
70:3a:d8:4c:0b:00
Apr  8 22:41:17 t440 dhclient[90380]: send_packet: No buffer space available
Apr  8 22:41:18 t440 wpa_supplicant[652]: wlan0: WPA: Key negotiation
completed with 70:3a:d8:4c:0b:00 [PTK=CCMP GTK=CCMP]
Apr  8 22:41:18 t440 wpa_supplicant[652]: wlan0: CTRL-EVENT-CONNECTED
- Connection to 70:3a:d8:4c:0b:00 completed [id=0 id_str=]
Apr  8 22:41:20 t440 dhclient[94537]: New IP Address (wlan0): 172.31.120.14
Apr  8 22:41:20 t440 dhclient[94538]: New Subnet Mask (wlan0): 255.255.255.0
Apr  8 22:41:20 t440 dhclient[94539]: New Broadcast Address (wlan0):
172.31.120.255
Apr  8 22:41:20 t440 dhclient[94540]: New Routers (wlan0): 172.31.120.1