Probably the hub isn't rebooting, more likely it's "re-registering" with the cable network. It looks the same to you and I, it takes as long, but the distinction is that re-registering is caused by a broadband connection that's so poor the hub has to let go and start from scratch, whereas a genuine reboot is usually a power supply or hardware fault with the hub.
At the moment you took that data, all was within accepted ranges, although downstream power is too high for my personal liking. The regular daily T3 errors in the network log are too frequent again for my liking. On their own I'm not sure they tell a clear story, but I lean towards this being a poor connection not a power supply or hardware fault. The low downstream error counts and the empty upstream timeout table suggest the hub had recently been restarted, and that clears the error and timeout counts.
If you can let the hub run for (say) 8 or 12 or 24 hours without you rebooting it or turning it off, and then repost all the data, then we can see if there's more frequent timeouts and errors. Also, I'd recommend you setup a BQM over at https://www.thinkbroadband.com/broadband/monitoring/quality That will show what's going on with your VM connection. Post a LINK to a LIVE, SHARED graph here and we'll see what's happening. Usually needs to run for 24 hours before we can draw reasonable conclusions, but the live graph will continuously update so you can post the link immediately.
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I suspect you are correct that this is happening because the broadband quality was so bad it let go, because when it happened this morning, I was actually using the Virgin 360 tv guide at the time and it couldnt even load the little thumbnails of the box sets etc - and then a few minutes later everything rebooted/reregistered.
So here is my plan:
-check all connections are tight
-pinhole reset router etc
-leave for 24-48 hr and repost all logs and the BQM report.
Sorry to hear you are having issues with hub resets. We can understand the inconvenience this may have caused. As mentioned by our community, please try the pin hole reset and monitor your service for the next 24-48 hrs.
Posting your BQM results will help us to diagnose where the problem may lay.