Conection works smooth, but after some time, it lost the conection between the nodes

Hi, Im having issues when conecting 2 or more nodes, conection used to work until a few weeks ago, the situation is, im transfering files between 2 windows devices, both has optic fiber conection, so transfer speed used to be stable at 50MB/s, but recently it goes on 50MB/s then drop to 0 or lost conection completly, after some time, it continues as usual for some time. In case of LAN gaming, it works smooth for some time then drop conection.

Our system are Windows 11, firewall seems not blocking conections as we have rules, but just in case, one computer uses Norton and other Kaspersky. Boths also have wired conection to the router with no repeaters.

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