I'm here to help you create and save transactions without logging out.
Before that, I'd to confirm if you received an error while doing transactions within your QuickBooks? If yes, please let me know by adding follow-up details below. This can help me provide a solution to your concern.
In the meantime, it's possible the app needs an update to keep up with your device compatibility. Also, the app stores cache files that can sometimes cause an unusual response to the system. You can clear the app's cache first by following these steps:
In the QuickBooks Online app:
Android: From More Options ⋮, select Settings, then select Refresh Data. Then, tap Yes.
iOS: From the Menu ☰ select Help & Feedback, select Refresh Data, and then select Refresh.
In your device Settings:
Android: From your device's Settings, select Apps (varies by device), choose QuickBooks app from the list, and then select Storage. Finally, select clear data.
iOS: From your device's Settings, select Setting General iPhone Storage and choose an app that's taking up a lot of space. To free up the storage without deleting the documents and data for the app, select Offload App.