I have this wireless connectivity problem with my Asus Zenbook UX305UA running ubuntu 20.04 in a WiFi-network spun by a Fritz!Box 7530 router. The PC establishes a WiFi connection but gets disconnected after a while (5 to 20min). The problem gets much worse, the further away the notebook is (10m to 30m distance). The connection does not seem to recover but when I force the NetworkManager to reconnect, it works fine for a while again.
Reading through the internet, I suspect that it is an issue with the network card choking on the newer WiFi-standard (the problem occurred since I changed my router). Other OS – including an old MacBook – have no problem in the WiFi.
This youtube-post explains the problem quite precise. The notebook has a Intel Corporation Wireless 7265 (rev 59) network controller. It seems that there occurred such problems quite frequently with the 7265D-family, but all used Windows (sometimes, the problem was a clumsy update of Windows, which was solved when either Windows or the (latest) Intel driver was reinstalled manually). I am using the Intel Wireless WiFi driver for Linux driver (iwlwifi) (Kernel 5.4.0.67).
The Linux wireless site explains that:
[7260, 3160, 7265, 7265D, 3165 and 3168] Those devices will not be supported by the newest firmware versions: the last firmware that was released for 3160, 7260 and 7265 is -17.ucode. Bug fixes will be ported to -17.ucode. 7265D, 3165 and 3168's latest firmware version is -29.ucode.
which is what I have already installed. So the advice to upgrade the iwlfifi driver as most posts suggested (such as this post on ubuntu 15.10) is somewhat already done.
Update
This post suggested an upgrade of the iwlwifi-driver. However, the links are outdated and my version is much newer (driver version 5.4.0-70-generic). According to the comments, the problem remains today (with newer driver versions and newer operating systems).
