After getting the switch going again at 08:46 it only lasted about 2.5 hours before going down again at 11:16. We immediately did the "pull the cords" power cycle which got it running again at 11:16.
At time of writing (15:34) it has been running for 4.25 hours.
As part of the investigation, sw-lvea-aux's logs is showing port 0/39 is flapping up and down every minute. We suspected this was the new itmx camera's port, so Camilla went into the LVEA and disconnected the ITMX camera. The power cycling of 0/39 stopped at this time (15:15).