My bank account has disconnected and I can’t get it to reconnect

Thanks for providing the error message, @paul-s-lofthouse.

Let me present to you some troubleshooting steps. So you're able to reconnect your bank in QuickBooks Self-Employed as soon as possible. 
 

If you're reconnecting your account using the app, I recommend doing this on a regular browser or incognito rather. To check if it's something to do with your application.

Use these shortcut keys: 

• Ctrl + Shift + N (Google Chrome)
• Ctrl + Shift + P (Firefox)
• Control + Option + P (Safari)
• Ctrl + Shift + P (Microsoft Edge)

Once logged in, please connect the bank again to check if it's functioning well. You can follow the steps below for your guidance. 

1. Go to the Settings ⚙ icon, then select Bank accounts.
2. Hit Connect another account.
3. In the search box, enter the name of the bank and account type.
4. Follow the on-screen instructions to connect your account. 

QuickBooks Self-Employed will automatically download your recent bank transactions. For more details, check out this article: Reconnect your bank account in QuickBooks Self-Employed. 

If you're able to reconnect the bank, I'd suggest resetting or uninstalling/reinstalling the QuickBooks Application. This is the same as clearing the cache from your web browser. Let me guide you on how.

For Android device:

1. From More Options, then select the Settings tab. 
2. Choose the Refresh Data menu.
3. Hit Yes. 

For iOs: 

1. Go to the Help menu.
2. Select Reset App Data.
3. Click OK.

For uninstalling the QBO app using the iOs device, you can touch and hold the app, then click the Delete app button. Nothing to worry about uninstalling the app because it won't delete the transactions and subscription you have. 

For android: 

1. Tap Settings on your phone.
2. Select Apps and Notifications, then locate the QBSE app.
3. Hit Uninstall. 

Once done, you can now reinstall the app. For the detailed steps, please browse through this article: How to download the QuickBooks Online mobile app.

If the issue persists after following the steps above, I'd recommend manually downloading the transactions and communicating with your financial institution. To identify if they have an ongoing issue that leads to this problem. 

Lastly, I want to ask what specific financial institution are you working with by clicking the Reply button below? This can help me check if there are any issues related to this matter. I'll be waiting for your response.