All my invoices and clients keep disappearing. Last time this happened I reinstalled the app but some invoices never reappear, the clients did, show as open invoices.

Thanks for mentioning that you have tried to remove and reinstalled the app before, emmamcgillmakeup. 

Let us also try to refresh your data and check if the invoices would show up again. Here's how:

If you're using an iOS device

1. Go to Menu ☰ and tap Help & Feedback.
2. Tap Refresh Data.
   Note: A message appears “Caution. If there was a problem getting your latest QuickBooks Online data, you can refresh it now. It may take a few minutes.”
3. Select Refresh to confirm.

If you're on an Android device

1. Go to Menu ☰ and tap More Options ⋮.
2. Select Settings, then Refresh Data.
3. Tap YES to confirm.

Once done, check if the data are now showing up. 

Just in case the issue persists, we'd want to take a closer look at this to determine why it's happening again. 

To do that, please reach out to our chat or phone support team for QuickBooks Online. They will be asking for additional details to sort this out. Here's how: 

1. In your QuickBooks Online, click the Help menu in the upper-right corner.
2. On the Search tab, click an article and select Contact us at the bottom. Then, enter the details of your concern.
3. Choose how you would like to connect with them: either via Callback or Chat.

Please check this article for our support hours: Get help with QuickBooks products and services.

Feel free to go to this article as well to see the list of all available features in the app: Compare Mobile App Features.

Let us always know if you have follow-up questions. We'll make sure that you get the help that you need.