QBO has anybody else experienced repeated tab crashes, particularly when entering lengthy transactions, requiring a do-over?

I understand that you're facing some challenges, b2bdna. Rest assured that I'll help you troubleshoot the issue. 

Most of the time, problems associated with accessing QuickBooks Online (QBO) has something to do with the browser version. For this, I recommend ensuring your browser is up-to-date. Here's a list of supported browsers: 

• Internet Explorer is no longer a supported browser.
• Google Chrome: version 78 or newer
• Mozilla Firefox: version 76 or newer.
• Microsoft Edge: version 79 or newer
• Safari: version 12 or newer (Mac only)
• Opera: version 68 or newer
• Samsung: version 10 or newer

Next, after ensuring that your browser is up-to-date and the crashing persists, I suggest accessing your QBO account through your browser's incognito mode, as this can be also a cache-related issue. Here's how:

• Google Chrome: Press "Ctrl + Shift + N"
• Mozilla Firefox: Press "Ctrl + Shift + P"
• Microsoft Edge: Press "Ctrl + Shift + N"
• Safari: Press "⌘ + Shift + N"

If this works, please proceed to clear your browser's cache. Doing so will remove and fix any problems and optimize the program's performance. 

Let me add this resource should you have other QBO-related concerns: Self-help articles.

We're always here in the Community should you have further updates on the crashing issue you've encountered. We'll do our best to assist. Take care.