Hello there, @pete31.
I recommend contacting our Customer Support Team. This way, they'll be able to further check the connection between your bank and QuickBooks.
You can speak to our representative through the Contact us feature in QuickBooks Online. I'll guide you how:
I've included an article about matching and categorising bank transactions in QuickBooks Online. This will help you keep your books accurate.
For other QuickBooks related concerns, let us know so we can help.