Modbus TCP/IP Communication Stop

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work with Modbus TCP/IP Communication on CPU S7-1200.
I've configured MB_Server block V3.1, but after 15 min it stops. 
In MB_Server_DB , Static - Request_Count and Server_Message_Count stop to go up, and Connected stays TRUE.
After I STOP and then START the CPU, Request_Count and Server_Message_Count, and Connected are reset. And again it stops after 15 min.

Any ideas?

Firmware - V4.0.

Thank you,

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Have you looked at the CPU diagnostic buffer in the TIA Portal software? Are there any fault/failure messages there? What does the MB block show for status and error?

Edited by pop29684
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