Message not assigned to Handler

Hi,

I'm encountering an issue with message assignment to valid handlers.

Scenario: I'm creating 1000 handlers and messages simultaneouly from an application system. I am able to be all 1000 EH and Mesages created in EM with no errors, however around 20 messages are still not assigned to handlers.

1. I've checked the /SAPTRX/LOCKEDEH table and do not see any entires for locked handlers

2. The handler is active

3. I cannot see any entry for the message in the /saptrx/eh_evmsg table

4. When i reprocess the handler, the message gets assigned

Does anyone know why this happens and how do we resolve this automatically?