I would try a pinhole reset of the Hub first. Do as below and then you will need to put it back to modem mode and reconnect your router.
First make sure the 2 passwords on the Hub sticker are still there and legible first ! Disconnect any ethernet cables (your router) from the Hub (leave the coax connected), and then with the Hub still "switched on" throughout, press reset pin in firmly with paper clip/SIM tray tool or similar "thin thing" and hold it firmly for at least 60 seconds, release the pin, leave for 5’ to stabilise - dont manually switch it off at any time. Then back to modem mode. See if that sorts it first
-------------------- John --------------------
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.
My upload has gone to zero again this morning, second time this week since I factory reset my router last week. No issues reported by Virgin in my area. My house is wired for Cat6a and I've been using this setup for years without issue.