Withdraw with Echeck and Pokerstars?

I didn't know exactly where to put this question so I just stuck it here..hope its ok :)

I've withdrawn at least twice in the past through echeck which gets deposited electronically into my bank account and it has worked. This past week I made three seperate withdraws and I know for sure that one of them (I think the middle one) has been declined. I got an email from stars saying:

Your recent Echeck cashout has been rejected with the reason 'Invalid
Account or Routing Number'.

I emailed back and they say that any more withdraws probably won't go thru either and that they were not told a specific reason why.

Does this happen alot? It seems stupid that it would suddenly happen esp having worked before. I would contact my bank directly but I don't have any kind of echeck routing number or something so they can see what happened.