If it's successful, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.
On the other hand, if the transactions are deleted, you can use the audit log feature. This report keeps track of your activities. You can see who made changes to your books and what they did. Refer to this article for further guidance: Use the audit log in QuickBooks Online.
Please let me know in the comment section below if you have any other issues or concerns. I'll be more than willing to answer them. Take care and have a great day!
Why are all my transactions in my bank register being deleted?
Thanks for updating us about this concern, @t-horst,
If you already tried FritzF's solution and still getting the same problem, I recommend getting in touch with our Support Team. They can take a look at your account and help you further with the solution.
Also, our agents can escalate this case to our developers if necessary. To get hold of our representatives, follow the steps below: