have you guys looked to see if they are throttling your devices from the device itself and not the account,who knows may be they use both.
there are several nv items that are responsible for that,450,69710 ect.At any point if your device ota's or updates it would be susceptible to it.and actually with devices updating over 3g and wifi now it can happen without you even knowing it did.
I am no mifi guy but nv's work the same in all quallcom based devices.may be worth a shot to look at them.
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