What is the name of the bank you've connected with QuickBooks? This way, I can further check for any reported issues similar to it. Just a heads-up though, QuickBooks only have a read-only connection with your bank. The system depends on the data your bank shares with us.
That being said, you can try logging in to your bank's website. Then, check for notifications, alerts, or any sign-in issues on your bank’s website that can potentially block QuickBooks from downloading new transactions. Once completed, you can manually update the bank to refresh the connection. Here's how:
Go to the Gear icon.
Select Bank accounts.
Click the Refresh all button.
You can repeat the same process, 3-5 times. Once completed, you can log out and log in from QuickBooks. You can check the Transactions page to see if missing transactions are now downloaded. Also, you can make sure toggle the filter options to easily locate them.
Go to the Transactions menu.
In the Type, Account, and Date drop-downs, choose All.
Scroll through the list of transactions to see all your entries.