WebSocket Ratchet does timeout exist?

Question

Yii

Under Yii2 cboden/ratchet is taken.
The launch was made from the server console nohup php /var/www/html/yii socket/run >/dev/null &.
The problem is that some time after starting, the connection no longer goes through. Working time is different - from 1 to 3 days.
The framework logs are empty, the Apache logs are also empty. Yes, and htop shows that the process is hanging and even with the same pid.
Has anyone had this problem and what advice can you give?