Running `supervisorctl restart <name>` causes xmlrpclib.Fault

Sometimes (for some reason not all the time), running sudo supervisorctl restart someservice returns:

<class 'xmlrpclib.Fault'>, <Fault 6: 'SHUTDOWN_STATE'>: file: /usr/lib/python2.6/xmlrpclib.py line: 838

In some odd cases this kills supervisord completely, printing "unix:///var/run/supervisor.sock no such file" whenever I run a command in supervisorctl manually. /etc/init.d/supervisor restart won't fix it, rather I need /etc/init.d/supervisor stop && /etc/init.d/supervisor start to get it back running.

I'm using supervisor 3.0a8 on Ubuntu 10.04.3 LTS (Kernel 2.6.32-21-server) 64bit.

Any idea how i can make the restart command not kill my supervisor and actually work?