Problem With 503 Service On An Axis Camera

Can anyone tell me what this 503 Service is? I get it on occasion on our Axis cameras. They usually go away after a reboot of the camera, but for some reason this one isn't. The camera is one of 11 cameras on the same switch.

The only thing different about this camera is that it's the only one of the 11 that's connected to a monitor via a mini hdmi cable to allow a person to see who's standing outside a service door.

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