lock_sys->mutex happened

We have two nodes and one arbitrator server.
From today one of our nodes that use only for read (Write routes to another node) after some hours stuck and can't service to a client.
When I want to connect to this node I get too many connections error.
After this, I have to kill mysql process and restart node to join to cluster again.
This problem occurs only on this node.
It's so strange for me because I thought this problem solved on mariadb 10.0.23.