WCF hosted in Windows service close all connections after some time


we are facing an issue with WCF service hosted in a Windows service with net.tcp binding. After some time it closes all connection (we see it in real time with TCPView). We noticed this behavior because in the client application log we find errors of TCP connection refused 10061. When all connection are close it starts to accept new conections. All firewall and antivirus has been disabled. RAM and CPU are ok. What can I look for?

Thanks

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