If I run the system monitor (meta-esc for me, or plasma-systemmonitor on the CLI), it works every other time.

The time it does not work, it seizes up the system: 100% use of a CPU and the memory usage quickly maxes out (16GB in my case). The system basically freezes up if I don't kill it immediately, necessitating a kill of the process via ssh client. Then it takes a minute or two for things to calm down and be usable again.

Then I run it again and it works fine. Then I run it again and it's not. The pattern repeats.

I note that stdout is slightly different on a successful vs. not successful run:

Last four lines of success:

qrc:/qt/qml/org/kde/kirigami/dialogs/Dialog.qml:344:18: QML ScrollView: Binding loop detected for property "implicitHeight"
QProcess: Destroyed while process ("/usr/lib/x86_64-linux-gnu/libexec/ksysguard/ksgrd_network_helper") is still running.
org.kde.ksysguard.plugin.network: Helper process terminated abnormally: ""
"There are still \"5\" items in the process of being created at engine destruction."​

Last three lines of failure:

qrc:/qt/qml/org/kde/kirigami/dialogs/Dialog.qml:344:18: QML ScrollView: Binding loop detected for property "implicitHeight"
QProcess: Destroyed while process ("/usr/lib/x86_64-linux-gnu/libexec/ksysguard/ksgrd_network_helper") is still running.
org.kde.ksysguard.plugin.network: Helper process terminated abnormally: ""​

Nothing shows up in the journal when this happens (besides what you'd expect in terms of things complaining about limited system resources). There were some "Pageflip timed out" errors one time.

$ kinfo
Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
Kernel Version: 6.11.0-9-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-4770K CPU @ 3.50GHz
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2