Fedora 42/43+ Write it off - Systemd-oomd issues.

[JWhite99]

They've tightened even the most ardent of fixes for keeping this FlatPak in RAM. It vacates it almost Immediately, with or without even playing anything.

The November 18, 2025 update tightened systemd-oomd even further (they bumped the default memory-pressure threshold and made the user-slice overrides less effective on Workstation). Classic Fedora: “We fixed a server bug… by breaking every desktop audio user.” Status 137 again, 451 MiB peak → oomd doesn’t care about our old MemoryMax=infinity anymore because the Flatpak scope itself now gets a hard sub-cgroup limit that ignores the parent slice.

Not even this works: sudo mkdir -p /etc/systemd/system/app-flatpak-me.timschneeberger.jdsp4linux-.scope.d sudo tee /etc/systemd/system/app-flatpak-me.timschneeberger.jdsp4linux-.scope.d/override.conf <<< $'[Scope]\nMemoryHigh=infinity\nMemoryMax=infinity\nMemorySwapMax=infinity' sudo systemctl daemon-reload

I just moved back to Kubuntu 25.10 and it's working like a charm no matter what I'm doing.