Same for me. Unusable when Tonverk is master. When I replace the Tonverk with other Elektron boxes it’s working perfectly.
It’s much better when Tonverk is slaved but not 100% rock solid: I set the Digitone as the master to both the Digitakt and Tonverk. The sync to the Digitakt is super tight, while the Tonverk is just a bit behind. I would not use the Tonverk in a live set up as it is.