RUT 955 serial over ip, process sodog could not accept connection

I have RUT955 with firmware 07.06.05 and use “serial over ip” configuration.
From time to time my com tcp-client (HW Virtual Serial port) could not connect to
Com tcp-server on my Teltonika (sodog).
After I restart sodog (kill -HUP procid_sodog) - everything is working fine!
What could be the problem?
There is nothing in the logread output.
Is there any diagnostics, logs or debug for the sodog?
Thanks for help!

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