80Mbps is always a suspicious number suggesting that the device/connection is being limited to 100.
Often this can because the cable you are using is only cat5 - or it may have failed. Try a new Cat5e/6/7 cable and see if it improves. Maybe just a short one whilst you test standing near to the Hub.
Also, is the device actually capable of going above 100 or is it limited by only having a 10/00 NIC card? If you know it has a 1GB card check in the settings whether it may have defaulted back to 100Mbps - also make sure the drivers are up to date.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.