I thought it might be worth to try the other versions of the FW.
So I renamed the files like:
sudo mv /lib/firmware/iwlwifi-8265-36.ucode 
/lib/firmware/DONOTLOAD-iwlwifi-8265-36.ucode

Eventually I ended up with:
-rw-r--r-- 1 root root 1811984 Apr 24  2018 
/lib/firmware/DONOTLOAD-iwlwifi-8265-22.ucode
-rw-r--r-- 1 root root 2234528 Dez  5  2017 
/lib/firmware/DONOTLOAD-iwlwifi-8265-27.ucode
-rw-r--r-- 1 root root 2307104 Dez  6  2017 
/lib/firmware/DONOTLOAD-iwlwifi-8265-31.ucode
-rw-r--r-- 1 root root 2440780 Apr 25  2018 
/lib/firmware/DONOTLOAD-iwlwifi-8265-34.ucode
-rw-r--r-- 1 root root 2498044 Jan 11 10:03 
/lib/firmware/DONOTLOAD-iwlwifi-8265-36.ucode
-rw-r--r-- 1 root root 2389968 Nov 17  2017 /lib/firmware/iwlwifi-8265-21.ucode

All versions >=22 Failed, no change in behavior at all.
When running with only 21 left it failed to load at all, see the following 
dmesg.

[    5.651536] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-36.ucode failed with error -2
[    5.651651] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-35.ucode failed with error -2
[    5.652037] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-34.ucode failed with error -2
[    5.652050] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-33.ucode failed with error -2
[    5.652057] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-32.ucode failed with error -2
[    5.652065] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-31.ucode failed with error -2
[    5.652072] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-30.ucode failed with error -2
[    5.652080] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-29.ucode failed with error -2
[    5.652087] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-28.ucode failed with error -2
[    5.652095] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-27.ucode failed with error -2
[    5.652103] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-26.ucode failed with error -2
[    5.652111] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-25.ucode failed with error -2
[    5.652119] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-24.ucode failed with error -2
[    5.652127] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-23.ucode failed with error -2
[    5.652135] iwlwifi 0000:04:00.0: Direct firmware load for 
iwlwifi-8265-22.ucode failed with error -2
[    5.652137] iwlwifi 0000:04:00.0: no suitable firmware found!
[    5.652140] iwlwifi 0000:04:00.0: minimum version required: iwlwifi-8265-22
[    5.652142] iwlwifi 0000:04:00.0: maximum version supported: iwlwifi-8265-36
[    5.652144] iwlwifi 0000:04:00.0: check 
git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git

I thought, well then I run it without recent FW load, but then the
wireless adapter doesn't initialize at all.

No chance to configure it in cmdline or UI tools.

Therefore it seems I know no way to get wireless to work at all on my T580 :-/
is there a Wireless dongle that works well with Linux?

If there is anything I can try to resolve this please let me know.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/1804841

Title:
  iwlwifi Microcode SW error detected.  Restarting 0x2000000.

Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  This seems to be a return of an existing bug, in newer hardware and
  microcode versions.

  Wireless card: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
  Firmware version: 34.0.1
  Description:    Ubuntu 18.04.1 LTS

  Frequent errors as soon as I connect to wifi:
  Microcode SW error detected.  Restarting 0x2000000.

  Expected to happen: Great and stable wifi like a couple of weeks ago
  What happens: very slow, intermittent internet access, lots of ping loss

  Found a suggestion of a workaround: adding these lines to
  /etc/NetworkManager/NetworkManager.conf

  [device]
  wifi.scan-rand-mac-address=no

  These lines were already there, not added by me.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-firmware 1.173.2 [modified: lib/firmware/iwlwifi-8265-36.ucode]
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
  Uname: Linux 4.15.0-39-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  Date: Fri Nov 23 15:23:54 2018
  Dependencies:

  InstallationDate: Installed on 2018-09-03 (81 days ago)
  InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)

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