Sort:  

It's a rare bug in certain versions of Docker. You can try to downgrade or upgrade your Docker version.

If for some reason you have issues stopping or removing it at any point, here's a fix:

docker stop witness
docker rm -f witness
docker network disconnect --force bridge witness
./run.sh stop

Got it, thanks! Been periodically checking every few hours. Seems to be fine now but, no increase in Steem, Steem Power or SBD.... wondering if I need to get more votes first