I have a Google Wallet card attached to my PSN account (of which that card is attached to my checking account, but there's a $300-400 ish limit that can be in there at any time IIRC).
For some reason if I try adding funds to PSN from it more than once or twice in a day, PSN will deny any and all future reloads from the card, or anything else that's tied to my account like PayPal.
But then I wait another day (or maybe a few hours, always waited a day before trying it) and it works again. So maybe it's some sort of a soft-lock Sony does but doesn't outright state?