Hi General Maximus,
My issue sounds different to yours as my superhub doesn't lock up at all. there has been no new firmware for the SH2AC either, it's still on V1.01.11 which I think has been out since February.
Here is is just earlier after 2 days of uptime:
and after rebooting it:
This is frustratingly infuriating when it happens every day or two.