I have the same error, it just started and I landed here because of google. I did a complete reinstall a few weeks ago. This mac is a brand new install with reformatted hdd. I had my Mpro 2018 15" Intel I7 32 GB Ram running like I always do and came home from a quick run and when I woke it up the message was there. So nothing I physically did to prompt this because before I left nothing happened, message appeared 3 hrs after I came back. Also be careful what you say on these boards because Apple censors, deletes and bans users if you talk bad about the brand or say anything about their quality is bad.