Hello,
When one specific player joins the console shows this:
"[spark-java-sampler-0-1/WARN] [spark/]: Timedo ut waiting for world statistics"

and after that it shows around 2-5 times displaying that message the server sends
"A single server tick took 180.00 seconds (should be max 0.05)"

and after that
"[Server Watchdog/ERROR] Considering it to be crashed, server will forcibly shutdown."

And other people have visited the chunks that the player is logged out on, and have even tried moving the location of the player back to spawn. When deleting the playerdata file it just fixes the problem for 1 day or so and after that it stopped working. He stopped using backpacks and danks just incase, but the error keeps happening.