This tool will find out what is causing this memory leak.
Once you get it working and active during such a memory leak event, report a bug with screenshots of the flamegraph, relevant indicators in different tabs.
You need debugsymbols with debuginfod so that it can work properyly.
We’d need to know your distro and whether you use X11 or Wayland to understand better.
This isn’t something common, I don’t have it on my laptop with a 9 days uptime (about time I reboot, got some updates), so something particular on your system triggers it. Just need to find out what.