Unless someone from the datacenter staff (Equinix) took it upon themseleves to go poking around inside the cabinet, no one was near it.
The power cord is secure, but I will certainly confirm the next time I go out there. The last time anyone was even in the cab was months ago.
This is the first time this happened. Prior to this, the system uptime was almost a year I think.
I will do the upgrade the next time I go out there.
Thanks to everyone to taking a look