VLC Video playing crashed after last xorg/amd driver update

as i remember since the last update in Febr./March for the xorg/amd driver update, VCL crashed every time when i try playing videos. The crash does no happen immediately - it takes a few minutes until the crash happens. the sound goes mess. i can not shut down the system normal; also [ALT][PRINT]+REISUB does not help; i can only push powerbutton to end

my graphic card is a AMD Radeon 285

Video playing under Firefox makes no problems.

Also no problems with my Laptop with AMD E2-Vision graphic under VLC

i do not know to make a crashreport when the system is under blocking condition.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: vlc 3.0.8-0ubuntu18.04.1
ProcVersionSignature: Ubuntu 5.4.0-77.86~18.04.1-generic 5.4.119
Uname: Linux 5.4.0-77-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.24
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Jul 19 16:26:25 2021
InstallationDate: Installed on 2019-07-26 (724 days ago)
InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: vlc
UpgradeStatus: No upgrade log present (probably fresh install)