None at all, none of the statistics match what's happening with the stability however, there has been two more MDD Timeout messages coinciding with brief 30 - 60 seconds of no internet since I made the first post though.
Here was the TBB monitor for the hub 3 before the switch:
vs now:
I've seen a few other people posting similar TBB graphs with the Hub 5 and having these disconnections, so it must be some kind of firmware bug, or the hardware is more susceptible to something?