I know how hard it is when the program crashes when you're working in the middle of entering a batch of data, @askc. I've come to provide a solution to keep your QuickBooks Online (QBO) running smoothly and efficiently.  

Let's perform some troubleshooting steps to rule out  the possibility of a webpage issue. At times, the browser stores frequently accessed data, which can result in unusual behaviors in any online platforms, including QBO. Let's access your account using a private browser by following the keyboard shortcut keys below.

• Google Chrome: Ctrl + Shift + N
• Safari 11 or newer: ⌘ + Shift + N
• Mozilla Firefox: Shift + Ctrl + P
• Microsoft Edge: Ctrl + Shift + N

Once it works, return your regular browser and clear its cache to refresh the website's preferences. You can also use the different supported browsers as an alternative.

For future reference, you can check this article when you want to know how to improve your system performance: Why is my QuickBooks Online slow?

Feel free to revisit this forum if you have additional questions when performing different tasks with QuickBooks Online. We're always around to help.