Hi,
I can reliably crash my RPI4b by browsing the Pictures. After a while the PI reboots.Doesn't matter which directory and / or pictures I choose or watch, so its not a specific file or dir. Randomly browsing is enough.
I activated logging and Pastebinned the kodi.old.log:
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When I installed the PI I had the same thing happen when adding sources for video and music: browsing to a directory led to a crash. I thought it was flaky power supply at my desk, but since then I ordered another power supply and moved to Pi to the living room. So low power can be ruled out I think. Also because it never happens when watching video either from file or streaming.