Hi Andre,
Is this over TCP/IP or HTTP? It sounds like there's some state-tracking issue going awry if this is happening over a failed synchronization attempt.
Are you positive these are non-overlapping requests? The times suggest otherwise...
Can you open an incident for this? We would likely need to gather additional network diagnostics to try and figure out what's going wrong in these specific circumstances.
Regards,
Jeff Albion
SAP Active Global Support