I keep getting Business Banking connection 350 errors. My business bank is with TSB. This is the 4th time in the last 7 days this has happened.

Hello and welcome to the Community, userjason.burman

We'll be happy to share some additional information about the 350 banking error in QuickBooks Online. 

This error usually occurs when the connection between your bank account and QuickBooks has expired and needs to be re-established for a further 90-day period. 

You can re-confirm consent in QuickBooks by following the steps below. (Remember to review the bank transactions downloaded before reauthorising. This will prevent duplicate transactions from being downloaded when you reconnect.)

1. Go to Bookkeeping, and then Transactions.
You may see Transactions and then Banking.
2. Select the ▼dropdown arrow next to Link Accounts.
3. Select Manage connections.
4. Next to the bank that you need to reconfirm consent for, select the More ⋮ icon.
5. Select Manage consent.
6. When you're ready, select Reconfirm.
7. Select OK to confirm.

Thanks for reaching the Intuit QuickBooks Community for support today. Please get back in touch if you need any further assistance.