You’re probably hitting similar problems as I reported last November ( https://github.com/fonsp/Pluto.jl/discussions/1686 ).
I now only use it with JULIA_NUM_THREADS<=4 and occasionally it wants a restart, typically less and less after a few restarts. Not ideal, but for now I can live with it. Still, running such a notebook in the REPL always works, so it is likely a Pluto issue.