I've tested with v4.14-rc3 and can confirm that the problem still exists
there.
Just a heads up for anyone trying to do the same: I had to put apparmor
policy for sbin.dhclient in complaint mode for a connection to work on
17.04/4.14rc3, otherwise I was getting the following deny events:
Oct 3 2
Public bug reported:
My base system where the problem occurs is Ubuntu 17.04 with distro
provided kernel 4.10 (-19, -33, -35), although the same was occuring on
16.04 LTS (that's actually why I've switched to 17.04).
WiFi stops working randomly, usually after couple of minutes after
system starts
