MS510TXUP WebUI randomly stops working

I have had this happen a couple of times now where the WebUI will just suddenly not respond.  Today for the first time I noticed the power LED is also flashing quickly on the switch, possibly to notify me there is an issue?  But I cannot find any mention of this error state.

I can still ping the switch, my SNMP monitoring still works and all switching and PoE is working fine.

The first time this happened it seemed one of the SFP+ adapters was slightly pulled out as it clicked when I pushed it.  This time though, everything is secure so I think that was just misleading and possibly the fibre connector itself not the SFP (makes sense, they are supposed to be locking).

I don't remember this happening until the latest firmware, or I think its the latest given I can't login to confirm.