Hello there, @Andre Nieuwstadt.
I've checked our records and found out that the open investigation about Nedbank is now closed and resolved.
If you see error 103, I recommend re-entering your login credentials provided by the bank. However, if the error persists, I recommend contacting our Customer Care Team. They can create an investigation ticket if other customers are experiencing the same thing.
You may also find this article helpful: What to do if you get a bank error or can't download transactions in QuickBooks Online.
If there's anything else that I can do for you, let me know by commenting below. I'll be around to help. Have a great day.
