A Microsoft file hosting and synchronization service.
I remember they told me here to change some settings on the File Vault (or something similar) and that helped. This issue has only resurfaced in the past 3-4 weeks on my end. I dunno when it happened. I wanna say around the time Apple release the new macOS (I miss saying OS X lol). But I haven't updated to the new macOS. Waiting for some of the major bugs to get worked out before getting into it.
Back to this, it still does the same thing. Especially when I wake up my Mac from sleep.