Weird.
Paypal did something similar with me, but temporarily. They made a big stink about my transferring some funds from my checking, into my Paypal account, out of simple convenience, for some online purchases. Couldn't access anything for a couple of days; froze that same Mastercard; cash remained in a pocket universe; and, after a half dozen calls, those sylphs finally claimed that it was some "new" Homeland Security issue; and that that transfer, of a nominal amount of money, less than five hundred dollars, if I recall, was somehow "suspicious."
About a week later, it was as if nothing had ever happened; no further explanation or communication; must have passed their litmus test. Haven't had that problem since . . .