That's not uncommon with both Upstream and DS SNR. Your forward levels should be between -6/+10 and SNR above 34. Return levels should be between 33-51 with SNR above 28 (ideally 32) but cant see US SNR from hub Data.
T3's are when Ranging Request Retries are Exhausted and can be caused by network issues or a faulty splitter or isolator. Check all connections are clean and tight and reboot the hub to clear counters. See what they are after 24 hours. Low numbers wont cause an issue so if there's no problems with service, i wouldn't worry
I work for Virgin Media - but all opinions posted here are my own