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Could be a bad cable causing the negotiated connection to drop to a lower speed or duplex. Or... the upstairs hub is old as you say and negotiating down to a lower rate or duplex for you. If your making your own cable runs get a tester, they are about $20 for a decent one that will show faults and loss.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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