Gary, Here's the log and stanza. As I suspected, wlan0 was not stable until after WeeWx exited. Perhaps this is specific to the Pi Zero W.
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[GW1000] driver = user.gw1000 poll_interval = 32 ip_address = 192.168.0.104 port = 45000 At the time of the test which is recorded in the syslog, I had commented out the IP address.