So I tried all three of those sysctl's and the problem is still
manifesting itself (every 10 minutes, Network Mananger pops up a
disconnected/reconnected message.

Moreover, I'll not that this problem does NOT exist in 14.04 (tested
with the same hardware, same wifi+ethernet, using a 14.04.5 LiveISO,
which uses the Xenial kernel (very close to the kernel I'm running here
on 16.04).

I really believe this problem is likely in Network Manager itself.  I'm
reopening that task for now.

** Changed in: network-manager (Ubuntu)
       Status: Invalid => New

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1664748

Title:
  wifi connection drops, reconnects every 10 minutes

Status in maas package in Ubuntu:
  Invalid
Status in network-manager package in Ubuntu:
  New

Bug description:
  I recently moved my home DHCP and DNS server over to MAAS (2.1.3 from
  xenial-updates).

  Since doing so, I've noticed that my wifi connection drops and
  reconnects (with corresponding Unity pop-up notifications) exactly
  every 10 minutes.

  I suppose this is due to the fact that MAAS sets DHCP leases to 10
  minutes by default?

  Has anyone else noticed this behavior?

  Is there a suitable workaround?  Increasing the DHCP lease time?
  Using static addresses?  Something else?

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