If there’s no crash report or indication of a crash in the log/console, the server could be hitting it’s memory limit and hard crashing due to an Out Of Memory Exception. Not too common, but can cause a “trace-less” crash as seen here.
Though overall that’s just my best guess since there isn’t much to go off of.
Scheduled restarts can help clear up memory leaks, and you could switch to the Paper server type, which is a performant fork of Spigot.
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