Public bug reported:

Sometimes a window stopped refreshing its contents. Different applications 
affected: known examples include xterm, Firefox, CodeBlocks, KDE lock screen.
No way found to revive in-time refreshing except full window closing (or blind 
login, in case of KDE lock screen). Keyboard or mouse activity in a such window 
doesn't help.
A one-shot refresh can be easily caused by switching to another virtual desktop 
and then back. After such switching, a window refresh is active for 
approximately 0.5 seconds, then stops again.
No relation to host uptime or X session uptime is visible.

Observed on two different hosts, both carrying Kubuntu 16.04 and running
XWindow+KDE as desktop environment. KDE is standard Kubuntu one.
Multiple virtual desktops are used on both hosts.

The issue started to appear approximately 4-5 months ago but I can't
specify exact package change that could have caused it. Both hosts are
regularly updated (no more than 1 week delay).

The first host has:
video: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. 
[AMD/ATI] Turks XT [Radeon HD 6670/7670] (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Turks XT [Radeon HD 6670/7670]
        Kernel driver in use: radeon
        Kernel modules: radeon
CPU: AMD FX-8150
RAM: 16GB
Installed as Kubuntu 14.04, upgraded to 16.04 via do-release-upgrade.
current kernel: linux-image-4.4.0-112-generic
video packages: non-HWE series (e.g. xserver-xorg=1:7.7+13ubuntu3); active 
driver: radeon

Issue rate on this host is rather tiny (~1 per week).

The second one has:
video: 01:00.0 VGA compatible controller: NVIDIA Corporation Device 128b (rev 
a1) (prog-if 00 [VGA controller])
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device 8c93
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_384_drm, nvidia_384
(really this is GeForce GT 740)
CPU:Intel i3-4170
RAM: 16GB
Installed originally as Kubuntu 16.04
current kernel: linux-image-4.13.0-32-generic (depended on by 
linux-generic-hwe-16.04)
video packages: HWE series (e.g. 
xserver-xorg-hwe-16.04=1:7.7+16ubuntu3~16.04.1); active driver: nvidia 
(proprietary), but the same issue observed with VESA driver.

Issue rate on this host is 1-2 per day and was much higher with VESA
driver in use.

No respective messages are found in Xorg.*.log or ~/.xsession-errors,
but the latter has got stream of messages like:

at host with AMD and Radeon:
kscreen: Primary output changed from KScreen::Output(Id: 86 , Name: "HDMI-0" ) 
( "HDMI-0" ) to KScreen::Output(Id: 86 , Name: "HDMI-0" ) ( "HDMI-0" )
kscreen: Primary output changed from KScreen::Output(Id: 86 , Name: "HDMI-0" ) 
( "HDMI-0" ) to KScreen::Output(Id: 86 , Name: "HDMI-0" ) ( "HDMI-0" )

at host with Intel and Nvidia:
kscreen: Primary output changed from KScreen::Output(Id: 640 , Name: "DVI-D-0" 
) ( "DVI-D-0" ) to KScreen::Output(Id: 640 , Name: "DVI-D-0" ) ( "DVI-D-0" )
kscreen: Primary output changed from KScreen::Output(Id: 640 , Name: "DVI-D-0" 
) ( "DVI-D-0" ) to KScreen::Output(Id: 640 , Name: "DVI-D-0" ) ( "DVI-D-0" )

such messages started appearing approximately at the same time, plus-
minus 1-2 months.

Additional info can be provided on demand.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
Uname: Linux 4.4.0-112-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Feb 13 11:47:32 2018
InstallationDate: Installed on 2014-12-16 (1154 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
SourcePackage: xorg
UpgradeStatus: Upgraded to xenial on 2017-03-29 (321 days ago)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1749150

Title:
  Spontaneous single window freezing

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