Ubuntu: Unreliable outgoing network connectivity


I'm running Ubuntu Server (16.04.3 LTS (GNU/Linux 4.4.0-112-generic x86_64)) on dedicated hardware (not a VM). I can reliably ping the server from outside. I can reliably ping localhost. But pinging (or anything else), including the Gateway IP, fails for about 15 seconds before it finally succeeds and then reliably works. Then I stop it, wait about a minute, and it'll fail again no the next try.

I'm relatively new to Ubuntu and have tried many things I've found in searching but nothing has improved the situation. Any ideas?

Here's my interfaces file

# The loopback network interface  auto lo  iface lo inet loopback    auto eno2  iface eno2 inet static      address 2XX.84.55.15      netmask      network 2XX.84.55.0      broadcast 2XX.84.55.255      gateway 2XX.84.55.1      dns-nameservers  

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