After four months and 20k+ loaded onto each card, both my GB account and my girlfriend's account were finally shut down. I called and got the same vague answer on the reason for closure as the majority on the thread.
We both had loaded funds only -- amounts varied from 200-2000 at WM. No withdrawals, billpay, ACH, or swipes.
It was nice while it lasted, but was way too tough trying to figure out how to balance maximizing benefit vs. trying to stay under the radar.
FF