It took me a while to figure out that Dropbox was in fact the cause of this.
This morning, after being away for a month, the PC (windows 10) froze up every 10-30 minutes after booting. A hard reset is the only thing that fixes it, although temporarlily.
The PC hasn't been online that much to sync 100%, only for short times by other users. In this case, I hae 300GB files where a lot needed refreshing/re-syncing. However, this is now impossible as with the PC running like this, it cannot sync again. I have tried to re-install Dropbox, but it is still causing the entire system to freeze (I waited 15 minutes then reset).
is there anyone out here with the same issues? Been running the PC without the Dropbox App now for about 4 hours, and didn't have a single freeze anymore. I need it for work and I have a Dropbox Plus account.