Robotframework tests get stuck

Question

Hi. I'm experiencing a weird bug. We have about 400 automation tests.
Usually the last test gets stuck and the process has to be killed.
Tests are run parallel using 4 docker containers. Tests are run through selenium hub.
I'm confident that its because of something in the environment.
And the process that gets stuck usually when running jenkins batches through ssh.

Is there something that the ssh lefts open and is interrupting the executed script?
I haven found any weird processes using "ps aux" or "ps -faux"

We use robotframework as a maven plugin

We are using centos7

What makes this even more weird, is that it doesn't get stuck when running the test for the first time. Running a second test gets stuck.

Answer 1

I haven't posted any code examples because I don't think it's because of any coding issues.