When a bank account is disconnected, this is often because there has been an update on the customer's side to their bank account, such as a change to their password or to their contact details.
Here are some steps that will help you connect your bank account again:
On the Overview page, click the purple 'Payment settings' button.
On the next page, select the Bank accounts tab and click 'Re-connect your bank account.'
If the above steps do not work:
Use the 'Replace' link on the top right of the bank account to re-enter the same bank information; or
Click the 'Remove' link on the top right of the bank account, and then re-enter details again.