At high loads (and the fans are rotating) and high WiFi traffic (watching streaming TV programs) the WiFi is disconnected in about 10-20 minutes, and that's systematically!
How to reproduce?
for high load: use glxgears program,
for high WiFi traffic I have used the program downloaded from https://www.molotov.tv/download (although it may not work outside France),
OS: Ubuntu 18.04.03 with a 5.3.0-24-generic kernel.
At high loads (and the fans are rotating) and high WiFi traffic (watching streaming TV programs) the WiFi is disconnected in about 10-20 minutes, and that's systematically! How to reproduce?
See also https://forums.intel.com/s/question/0D70P000006dY8a/random-disconnects-on-wifi-on-linux-ubuntu-1804-laptop-with-a-dual-band-wirelessac-8265-module-message-is-deauthenticating-fromby-local-choice-reason-3deauthleaving and https://github.com/tuxedocomputers/tuxedo-fan-control/issues/28.
I have managed to solve my problems by disabling the tuxedofancontrol and finally deleting the package and unloading the tuxedo_wmi module.