Domain Controller/DNS Server lost ping connection to my Sonicwall Router

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Hi everyone,I hope you can help me identify what is possibly happening on my network.I have my ISP modem, then I connect a small 4-port switch (just for test ISP connection in case of internet issues), from here I connect my SonicWall Router/Firewall with DHCP service, then I have a 48-port switch for all my computers and my Domain Controller and DNS server.I’ve been having disconnections on my computers to the shared files on the server and also lose internet for a few minutes.Last week, when it happened I pinged from my DC-DNS server to the IP Router/Firewall and I noticed that some packets

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