I forgot... I'm using Ubuntu 18.04 LTS with all updates up to date.

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  Internet drops every few minutes on wired and wireless connection

Status in network-manager package in Ubuntu:

Bug description:
  Internet drops every 1-30 minutes when connected via wired or wireless
  (i.e., this is a problem on both wired and wireless) even though
  connection icon indicates the computer is still connected.

  Disconnecting and reconnecting via the connection icon resets internet
  temporarily until the next time.

  Dropped internet is discovered with "The site can't be reached"
  screens in Chromium, or error messages when downloading/updating in
  Terminal, or missing connection in Ubuntu Software app, or stalled
  syncing in Insync application (occurred even without Insync).

  Internet drops more frequently on wireless than on wired.

  It seems to disconnect more frequently with heavier internet use
  (e.g., downloading multiple files, opening several webpages in quick

  This is a fresh install (yesterday) of Ubuntu 16.04 on a Dell Inspiron
  15 5567 (dual boot). It occurs when running Live CD as well though.

  Ethernet and wifi both work without randomly disconnecting in Windows
  10 on the same machine, and ethernet and wifi work on other machines
  running Ubuntu and Windows with the same router, so it is not a
  hardware or router issue.

  Output from sudo lshw -class network

         description: Wireless interface
         product: Wireless 3165
         vendor: Intel Corporation
         physical id: 0
         bus info: pci@0000:02:00.0
         logical name: wlp2s0
         version: 79
         serial: 58:fb:84:55:21:52
         width: 64 bits
         clock: 33MHz
         capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
         configuration: broadcast=yes driver=iwlwifi 
driverversion=4.4.0-62-generic firmware=17.352738.0 ip= latency=0 
link=yes multicast=yes wireless=IEEE 802.11abgn
         resources: irq:283 memory:df100000-df101fff
         description: Ethernet interface
         product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
         vendor: Realtek Semiconductor Co., Ltd.
         physical id: 0
         bus info: pci@0000:03:00.0
         logical name: enp3s0
         version: 07
         serial: 18:db:f2:3c:d5:37
         size: 10Mbit/s
         capacity: 100Mbit/s
         width: 64 bits
         clock: 33MHz
         capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet 
physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
         configuration: autonegotiation=on broadcast=yes driver=r8169 
driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 
latency=0 link=no multicast=yes port=MII speed=10Mbit/s
         resources: irq:279 ioport:d000(size=256) memory:df000000-df000fff 

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.2.2-0ubuntu0.16.04.3
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Feb 21 16:36:55 2017
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2017-02-20 (1 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
   default via dev wlp2s0  proto static  metric 600 dev wlp2s0  scope link  metric 1000 dev wlp2s0  proto kernel  scope link  src  
metric 600
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
   DEVICE  TYPE      STATE        DBUS-PATH                                  
CONNECTION       CON-UUID                              CON-PATH
   wlp2s0  wifi      connected    /org/freedesktop/NetworkManager/Devices/0  
pr500k-9912ec-1  36301ded-0ac5-4a86-9621-87290ef159af  
   enp3s0  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  -- 
              --                                    --
   lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/2  -- 
              --                                    --
   running  1.2.2    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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