In my case it works also by setting the IPV6 to "Automatic, address only".
Try like this. Turn off the connection, set it to Automatich, address only or 
"Ignore" and then re-enable the connection. In my case this procedure works 
(see attachment)

** Attachment added: "Istantanea_2018-03-06_19-03-28.png"
   
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1752681/+attachment/5070976/+files/Istantanea_2018-03-06_19-03-28.png

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https://bugs.launchpad.net/bugs/1752681

Title:
  wireless disconnect

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  There are many problems reported about random and quick
  disconnect/reconnect of the wireless connection in ubuntu. Some say,
  disabling the ipv6 is the solution but it isn't!

  I really do want to find a way to debug what happens that the wireless
  connection drops randomly. But I couldn't find a tool for that.

  The output of the following commands are attached:
  uname -a
  ifconfig
  cat /proc/sys/net/ipv6/conf/all/disable_ipv6
  iwconfig
  lsmod
  dmesg

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