True. Large drives will make fsck take a long time. I have an 1Tb external USB for now, but will move data to an external NFS later. Will turn on logging and see what it will reveal. Problem is that hangs are quite random. Might go days when it works without issues, then it just hangs several times one evening.
Edit: Turning on debugging also turns on a rather annoying on-screen display of CPU % and such. I would not mind if it was there when playing music, but it is there when watching TV…