Stats all looking good to me. Post up the BQM link as soon as it develops that might be more informative
Is your son connecting on an ethernet cable to this PC? First thing I would suggest is to exchange the ethernet cable for a New Cat6a one and see if that helps. These have better shielding from crosstalk and interference.
Also basic stuff like, checking all of your coax cable connections are in nice and "finger" tight - at the Hub and wall box and also at any connectors etc. Ensure there are no “unterminated cable loose ends. Disconnect all the connections and reconnect to be sure. Also check that the internal wiring is ok with no damage, kinking or chaffing, check that all looks good with the outside cabling and wall box (no “staples, etc.,) piercing the cables.
A Hub pinhole reset would do no harm either - like this.... first make sure the 2 passwords on the Hub sticker are still there and legible first ! Disconnect any ethernet cables from the Hub (leave the coax connected), and then with the Hub still "switched on" throughout, press pin in firmly with paper clip/SIM tray tool or similar "thin thing" and hold it firmly for at least 60 (a timed sixty) seconds, release the pin, leave for 5’ to stabilise - dont manually switch it off at any time.
Note that all passwords/SSID's will reset to those on the sticker so you may want to go in and change them back to what you want. See if that helps
Someone else should comment soon hopefully with more ideas.
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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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.