I have a Babboe City cargo bike with a Shimano Nexus 7 rear hub. Just coming into home on my last ride there was a bit of noise from the drivetrain and, on closer inspection, some other symptoms. The back wheel now has a wobble that is coming, as far as I can see, from somewhere inside the hub (i.e. this is not a broken spoke or similar issue, the hub wobbles along with the wheel). I tried taking a couple of videos, apologies for the shaky camera but I hope the issue is visible. I think it's probably clearer in the first link below. The wobble is present when turning the pedals backward, i.e. the drive is not engaged, and seems to be unchanged when I change gears.
Along with this, the pedals get 'pulled along' by the rear wheel (another video below). Holding the pedals in place will allow the read wheel to keep spinning without any horrible noise, but there is some rubbing noise coming from inside the hub (?) which causes the back wheel to come to a stop rather quickly. To my ear the noise sounds like bearings rubbing (?), but not crunching or grinding.
I'm trying to assess whether I'm looking at a repair, either to be done myself or by a shop, or looking into replacing the hub (or wheel). I'm reluctant to open it up without a plan, since from the diagrams I've seen it's not the simplest of mechanisms. In terms of overall maintenance skill level I'm reasonably experienced. I have an '80s era road bike that I maintain myself, and I either have or would be comfortable adjusting or replacing any part on that bike. However, I've never worked on an enclosed hub.