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TCP retransmissions - looking for explanations

Hi all,

we are running an automation line where we have a S7 communication (Port 102, RFC1006) to a MES.

At certain timepoints the connection will breakdown and reconnect after a couple of seconds. We are still trying to figure out why this happens, that's why I installed a wireshark logging at both the server and client side.

We get some spurious TCP retransmissions, but I can't explain why these happen. Maybe some of you can give me an answer to that questions.

Please find the logs (server & client side) under this link: Thanks all in advance!