Fifty segments and threads is a very, very large amount.
Not trying to be offensive here, but the chances are very slim you actually need that much work going on at the same time.
On the other note, it is good to know that the Kafka extension is not out of beta yet.
Thus, some bugs can be expected. If you find something promising, I would kindly ask you if you can file an issue for it on the Kafka Extension GitHub page.
If you want a more thorough solution fo dispatching events without bugs, I would highly recommend giving Axon Server a try.
That’s my two cents to the situation.
PS. It is important to note that this mailing list will be discontinued as specified in this thread.
Instead of this mailing list we have moved to use a forum style of communication, at https://discuss.axoniq.io/.
Hope to see you there!