The behaviour on channel switch on the 5 GHz band seems somehow erratic as what 
happens can be either:
1 - what I described in post #23
2 - syslog and kern.log grow endlessly, as seen before
3 - the wifi card disconnects and manages to reconnect itself as seen in 
included log file "syslog reconnection completed"

** Attachment added: "syslog reconnection completed"

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  Intel Wireless 8260 [8086:24f3] Subsystem [8086:1010] on channel
  switch, iwlwifi Microcode SW Error: FW error in SYNC CMD

Status in linux package in Ubuntu:

Bug description:
  Ubuntu Mate 20.04, with all supplied kernels up to

  I occasionally see a message on my screen that disk space is low. I
  try rebooting since my computer is unresponsive. Normal reboot does
  not work, sudo reboot does not work. I have to power off the machine
  using power button. Machine boots but hangs because its trying to
  repair journal info.

  I can't see what causes that since I was not using my computer at the time.
  edit: see comment #14

  So with a live session, I can see that syslog and kern.log files have
  grown to several GB until the drive is full.

  When using an upstream kernel 5.4.43-050443-generic x86_64, I haven't had any 
problem so far.
  edit: not true actually, this happened again using this upstream kernel.

  Never had this issue with previous Ubuntu versions with the very same
  hardware configuration, since 16.04.

  Included: partial syslog and kern.log with the same message repeated over and 
  edit: and when the event starts.

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