Cisco 3750-X dropping IP cameras

Dealing with an issue of widespread failure of primarily Vivotek FD8134 IP (PoE) powered cameras spontaneously failing on a shared stack of Cisco WS-C3750V2-24PS-S .

These switches handle flow and distribute power to IP cameras, VoIP handsets, and WAPs.

The issue is that cameras at one point worked as expected, but have dropped off and not come back online.  Simply moving a camera to another port doesn't bring the camera up.

However, if I independently power a camera from a PoE midspan injector, the camera comes up just fine and data even flows back through the previously dead port such that I can see the camera as normal.   All affected cameras work normally once excluded from the 3750-x stack.

Affected cameras are not limited to just one type of camera, but all the same brand - Vivotek.

Also, if I take another brand of camera (different MAC) and plug it into the switch, power and data flow normally.

I am inclined to think I have some sort of power problem relating to the switch, but I'm not a Cisco VAR and haven't serviced this type of switches before.

My questions:

1. If my cameras are IEEE 802.3 af compliant, and this switch is capable of pushing IEEE 802.3at power, does the switch 'autosense' the appropriate wattage and supply my devices with that?

2.  Is there some form of 'MAC address' or 'Access Control List' filtering in these switches that could be prohibitting my devices from being granted power by these switches?

Try adding these lines to a port with an attached camera

description POE Camera

power inline static max 15400

power inline consumption default 15400

Also, after attaching a camera, use these commands WS-C3750X-24P-S   to shut down, and then restart then port.  Having the port come up with the camera already attached may trigger a POE sync