If you were offered a Hub 4, then unless you had upgraded to 1 Gbps it will be because your area is suffering over-utilisation problems (VM sold more contracts than their equipment could support local to you). The BQM has the shape of over-utilisation, looks like you also have a noise issue as well.
The Hub 4 uses DOCSIS 3.1, this is more demanding of line quality, so the indicated noise problems can usually be fixed, whether that removes the peak time hump caused by over-utilisation only time will tell, I would tend to suspect not. You say you're going back to the Hub 3 - that is less sensitive to line quality, so might offer some improvement, but would be equally susceptible to over-utilisation. I reckon you had the over-utilisation problem beforehand, possibly didn't know that?
If it is over-utilisation and the Hub 3 isn't much better, the outlook is not good. VM fight a continual battle to keep upgrading the network for data use that rises around 30% every year, and spend millions doing that, some areas don't get upgraded fast enough (or at all), and then it can be months and in some cases years before the problem is resolved, during which time VM issue utterly meaningless fix dates. But that's getting ahead of ourselves - let's see what happens when the Hub 3 gets connected, assuming it does turn up.
