What does Device Utilization in Organization > Summary show for the network? I was able to counter support trying to explain an issue away with "over utilization" by showing utilization was actually fine. In this case, a firmware bug might cause high device utilization. But if the graph doesn't show it, you can use it as a counter argument. In my case, they were counting total clients, which was higher than recommended, but half of the devices were IP phones that sit around doing nothing most of the day.
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