The DHCP client behind the 880L bridge in 5GHz got its IP address lease renewed once. Exactly one relevant message was captured into syslog:
DHCP: Client receive ACK from 192.168.1.1, IP=192.168.1.28, Lease time=86400
Previously, when a DHCP client got cut off from the internet, it was often at the 12-hour mark when the client attempted to renew its IP lease but got no response from the DHCP server. No messages were captured into syslog for this failure, as far as I could tell.
Yesterday the 880L went into a mode where no syslog messages were being seen, so I rebooted the unit. I thought it was because Windows got upgraded for the client running Kiwi syslog server, but it turned out to be the 880L not sending out syslog messages even when configured to do so.