BE3600 drops ethernet connection periodically

Periodically , at random intervals, the BE3600 will drop the plugged in ethernet connection and doesn't recover. I have either unplug and plug or reset the interface through the OS to get it working again

This is an extremely disrupted bug , I see nothing logged specifically and is not acceptable for something touted at as a high end router.
Routers do not randomly shutdown the interface to a connected device and not restore it

Try a different/'known good' cable. Stranger things have happened.

Also, logread -e netifd might turn up something.

What is the device connected to the other end of the router’s Ethernet port?

By the way, please export the complete logs of the router. We may try to obtain and analyze more information from them.

I changed the cable with a new one still the same.
I don't want to provide full logs for obvious reasons and I purchased the product for use not experimentation. If I wanted to do that I would have bought a raspberry pi.
I uploaded the latest image and also the same behavior

NIC
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)

Please try to lock the negotiation rate "2.5Gbps" in your computer's NIC network card settings