Service Task execution takes up to 30 minutes

We use Camunda 8.3.1 and have some problems with the BPM below. In this test we started ~230 processes and approx. 200 reached the message catch event very fast < 1 second. For the other ones the processing took several minutes (up to 30 mins) to pass the Service Task marked with the red arrow. The logic within the service task was always completely done in less than 200ms. We wonder what could cause the service task to be stuck after its processing. In the log we found no errors and in the end (after 30 minutes) all processes reached the message catch event.

Do you have a hint what could cause this issue or how to check?

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