Internet Problem on new PC (Ethernet)

[Microsoft Windows]

Since I got my new PC, I have been experiencing problems with my internet: I get kicked out of Fortnite games randomly, experience packet loss in Rocket League, Roblox gets stuck on the "Joining Server" screen, and I can't watch YouTube videos at 720p or higher because they load too slowly and become laggy. However, when I do a speed test, everything seems fine—I get over 200 Mbps download and over 40 Mbps upload speeds.I’ve looked for solutions but couldn’t find any. It’s not my router or ethernet cable, because when I plugged the same ethernet cable into my laptop, it worked perfectly fine.

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