Nothing stands out as wrong... so I'd say set it up for a nightly reboot to deal with symptoms for now. I had a chance to observe the hub in its "high load" state, and busy bits happened to be in an OS process, which our support tools have limited access to. My best guess is it's trying to use swap space, the symptoms match. But there doesn't seem to be enough going on otherwise to trigger swap. In a nutshell, I don't have a root cause yet. However, a band-aid solution may work just as well, and there's a hub rebooter community app that makes reboot setup a breeze.
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