There are optional settings you can add to your coordinator uri to fix errors like socket timeouts.
For redis see:
https://github.com/openstack/tooz/blob/6e7a8508fbcbe9ceacb04490dc8330501bfa2477/tooz/drivers/redis.py#L141
In my specific situation I set my coordinator setting in st2.conf to:
[coordination]
url = redis://127.0.0.1:6379?socket_timeout=90
lock_timeout = 180