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:
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.