Connection speed switches automatically from 1 Gbps to 100 Mbps

So I have an intenet connection that lets me use 600Mbs initially when I plug in my etheet cable I can see 1 Gbps connection speed (in etheet status window). The issue is that I can see that every now and then 5-10 min I see duration reset (in etheet status window) and usually on the first reset (some times on the second one) speed switches to 100Mbps and now I have max speed of 10MBs for the love of god I dug through google left and right, can some one lend me a hand on this one?

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