Public bug reported:

dell inspiron 15 3565 and intel 3165. Difficult to report when wifi is

Happens sometimes after a few minutes, never more than 30 minutes. Easy
to capture journalctl when the network connection hangs. Intel fails on
2.4 GHz or 5 GHz, using several different AP's.

The same system runs stable and perfect with a USB dongle Realtek
RTL8188CUS, but I have to blacklist iwlwifi in
/etc/modprobe.d/modprobe.conf to prevent iwlwifi hanging all network
activity while simply scanning and not connected to an AP.

I've had similar problems with this system under 17.10, but it has
become more reproducible under 18.04. I've back-levelled the driver as
far as possible, but they all hang the network. Because version 29
firmware is the latest in the bionic repository, and also on the intel
support web site, I won't confuse matters by reporting earlier ubuntu
kernels or iwlwifi versions

** Affects: linux-firmware (Ubuntu)
     Importance: Undecided
         Status: New

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  iwlwifi-29 kernel timeout queue active on fifo 2 and stuck

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