I have experienced simular issues with my Pi3 connecting to nodes, keeping time, updating Echolink online hosts all while using the onboard WiFi. What I found is that the DNS Name service IP was not being correctly applied to /etc/resolv.conf. See if you replicate the issues by following these steps: Execute: cat /var/run/resolvconf/interfaces/wlan0Result (yours will be different but should look simular):domain hsd1.ca.comcast.net.nameserver 192.168.240.1 Execute: cat /etc/resolv.confResult:# This file is managed by systemd-resolved(8). Do not edit.## Third party programs must not access this file directly, but# only through the symlink at /etc/resolv.conf. To manage# resolv.conf(5) in a different way, replace the symlink by a# static file or a different symlink. Execute: cat /etc/systemd/resolved.confResult:# This file is part of systemd.## systemd is free software; you can redistribute it and/or modify it# under the terms of the GNU Lesser General Public License as published by# the Free Software Foundation; either version 2.1 of the License, or# (at your option) any later version.## See resolved.conf(5) for details [Resolve]#DNS= Execute: ping www.google.comResult:ping: unknown host www.google.com If the above matches your case, I suggest doing the following:Execute: resolvconf -u(No result displayed) Execute: ping www.google.comResult:PING www.google.com (74.125.135.103) 56(84) bytes of data.64 bytes from pl-in-f103.1e100.net (74.125.135.103): icmp_seq=1 ttl=44 time=42.0 ms^C--- www.google.com ping statistics ---1 packets transmitted, 1 received, 0% packet loss, time 0msrtt min/avg/max/mdev = 42.074/42.074/42.074/0.000 ms Execute: cat /etc/resolv.confResult: # Generated by resolvconfdomain hsd1.ca.comcast.net.nameserver 192.168.240.1 Now you can see that the nameserver is defined and DNS name resolution functions correctly. Suggested perminent fix:Add the following lines to /etc/rc.local just under the existing comments:# Update DNS Resolution$(which resolvconf) -u Execute: shutdown -r now After the reboot is complete, login and verify DNS resolves. A simple ping is enough to verify. Please reply if this solves your issue.