Version: 66.0.3344.0
Reproduction Steps: 
1.Enable Chromevox Next, and navigate to drive.google.com. Note that there has to be a list of many folders and directories to replicate this behavior. This happens with Chrome OS with CHromevox and NVDA on Windows.
2. Down arrow through the list of files and directories. For me, it happens if there are more than 40 items, and it happens at a different item in the list.
3. Keep arrowing down to the end of the file list.
Expected: Each file is announced. I should be able to focus on, and open any and every file and directory.
Actual: Right at about item 37 (this happens at a different item each time), Chromevox and NVDA lock up. Pressing down arrow repeatedly does nothing. Tabbing does not focus different elements on the screen. Navigating by object with Chromevox announces a more options button, but I hav no options to get back to my list of files. Escape does nothing. There are not any messages or alerts uttered or visible to the screen reader. I am not sure what to do or how to eliminate this behavior.