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I've recently installed Ubuntu 16.04 LTS on a Lenovo W540 Thinkpad, and I am having issues with my wireless network allowing network traffic. The /var/log/syslog and journalctl -xe output during the problem is as follows.

Oct 15 18:41:34 phil-ubuntu whoopsie[2221]: [18:41:34] offline
Oct 15 18:41:34 phil-ubuntu whoopsie[2221]: [18:41:34] online
Oct 15 18:41:55 phil-ubuntu NetworkManager[1320]: <info>  [1508110915.3547] policy: set 'Home Internet Connection' (wlp3s0) as default for IPv6 routing and DNS
Oct 15 18:42:32 phil-ubuntu whoopsie[2221]: [18:42:32] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:42:32 phil-ubuntu whoopsie[2221]: [18:42:32] offline
Oct 15 18:42:53 phil-ubuntu whoopsie[2221]: [18:42:53] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:43:14 phil-ubuntu whoopsie[2221]: [18:43:14] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:43:36 phil-ubuntu whoopsie[2221]: [18:43:36] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:43:57 phil-ubuntu whoopsie[2221]: [18:43:57] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:44:18 phil-ubuntu whoopsie[2221]: [18:44:18] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:44:21 phil-ubuntu wpa_supplicant[1903]: wlp3s0: WPA: Group rekeying completed with c0:56:27:0a:28:10 [GTK=CCMP]
Oct 15 18:44:39 phil-ubuntu whoopsie[2221]: [18:44:39] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:45:00 phil-ubuntu whoopsie[2221]: [18:45:00] Cannot reach: https://daisy.ubuntu.com
Oct 15 18:45:10 phil-ubuntu gnome-keyring-daemon[2792]: asked to register item /org/freedesktop/secrets/collection/login/7, but it's already registered
Oct 15 18:45:10 phil-ubuntu gnome-keyring-daemon[2792]: asked to register item /org/freedesktop/secrets/collection/login/9, but it's already registered
Oct 15 18:45:10 phil-ubuntu gnome-keyring-daemon[2792]: asked to register item /org/freedesktop/secrets/collection/login/7, but it's already registered
Oct 15 18:45:10 phil-ubuntu gnome-keyring-daemon[2792]: asked to register item /org/freedesktop/secrets/collection/login/9, but it's already registered
Oct 15 18:45:11 phil-ubuntu whoopsie[2221]: [18:45:11] online
Oct 15 18:46:40 phil-ubuntu kernel: thinkpad_acpi: EC reports that Thermal Table has changed
Oct 15 18:46:43 phil-ubuntu kernel: thinkpad_acpi: EC reports that Thermal Table has changed
Oct 15 18:47:48 phil-ubuntu gnome-keyring-daemon[2792]: asked to register item /org/freedesktop/secrets/collection/login/10, but it's already registered

For some reason, as long as I keep a constant ping going to something like Google or Bing, or even my network gateway, I don't get the whoopsie issue, and can continue using my device as intended. When I turn off the ping, the network connectivity goes out after ~30min or so, it varies a lot.

I'm not sure what else to search for or show for information, so please let me know and I'll make edits.

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As per the reference : https://gist.github.com/okapies/de0d08f9e3c8bcb2b76a33b68f62a48c

This might be Kernel issue:

Try to reinstall the current linux-header

I hope this will solve your problem.

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Wifi card going to sleep

To save power many wifi cards will go to sleep to save power. In some cases the card will not wakeup from sleep: 16.04 LTS wifi connection issues

To summarize the solution in the accepted answer:

  1. Get details of your PCI wireless card by running sudo lshw -class network

  2. Get your card model info according to the product line. For instance, as you can see in the question description it says product: RTL8723BE PCIe Wireless Network Adapter so the model of my card is RTL8723BE

    Or product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller so the model of my card is RTL8101/2/6E

  3. Give the permission sudo chmod 755 /etc/pm/config.d/

  4. Open or create config and add SUSPEND_MODULES="rtl8723be" (replace rtl8723be with your own model number)

  5. Then run echo "options rtl8723be fwlps=N" | sudo tee /etc/modprobe.d/rtl8723be.conf

  6. Finally restart your system.

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