Yeah, It happened when I was online, it turns out that the update for Griefprevetion, that is litearlly titled, I kid you not:
Fixed a bug that could cause the server to hang
So yea, probably a good idea that you update now.
“So yeah probably a good idea that you update now”, or not mate, more like, causing crashes. I really miss the old developer, the guy also didnt listen to a few bugs I reported, just shrugged them off with lame excuses.
I backdated the plugin, but it wont take effect until next restart, sorry about this, I updated GP taking the devs advice.