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I believe we have go through this issue before and that is the hello_client has no problem connecting up 8 slaves (4 slaves enabled by default). You may want to check through your code against the hello_client.
I assumed it's a typo that you used SDK version 2.2.2 instead of 2.2.3.
I test SDK 2.2.2 and 2.2.3, both sdk has this issue. I capture another log, it is obvious to check the issue occurs step, when this issue occurs, there is no connection up event and just connection down event