You have to go to the bank account and click the pencil icon. Then click the Disconnect upon save and exit button. Then save and exit. This will completely break the link. However, you still have an account in your books you just need to reconnect them. Go the the link account button and follow the on-screen prompts to link the account. It will ask if you want to connect it to an existing account. Make sure you select the account name as it appears in your books. Also, it will ask what date you want to begin importing transactions. Use the first date the connection stopped working. Hope that helps.