Ok, I will try rr module from 4.0 branch and if it won't help from master branch.
Have you tried the latest code on the 4.0 branch as I am sure there are fixes that have been made since the last release?
Also, if using WebSockets I do strongly recommend you try Git master if you have any problems. There may well be fixes there that haven't been back-ported to the 4.0 branch yet.
Regards,
Peter