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At 1000MB on CAT 5e you can get a reliable 30 meters given the consumer class switch and router (that I assume you have). To test this theory you can hard code your ports to a slower speed, if possible, something like 10MB/Half and see if it negotiates.
However this all for not with a bad cable, and it really sounds like you have a bad or poor cable, or possibly a bad switch port or patch somewhere in there.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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