Could be a problem that occurs when the network is busy, rather than a simple case of over-utilisation. Whilst the overnight lull is persuasive for O-U, the daytime traces are less so, because there's no build up across the day, and although the afternoon's not ideal, it's not that bad.
What I do observe is that you are running a Superhub 2 (a decrepit antique using out of date technology), and your SNR is borderline on a couple of channels. Potentially your problems might be fixed by a replacement of the hub, and the line setup tweaking to improve SNR. The best you can hope for here is that the forum staff agree there's a problem and assign a technician, and that the technician replaces the hub and tweaks the line; Sometimes that's straightforward, sometimes you'll get claims that VM can see nothing wrong, and have to be very persistent. Or to be more Machiavellian in how you ensure that the matter is addressed.
If you get the hub replaced and SNR improved, and the BQM still looks like that (check the IP address the BQM monitors is still the one for your connection, they can change), then at that point I'd agree that O-U may be a culprit. The bad news then is that at the level of O-U that would be indicated then you might find that the problem is not, in VM's opinion, sufficient to pass the threshold used to decide that there is a problem. Worry about that when the existing issues have been resolved.
