Google Chrome	64.0.3268.0 (Official Build) canary (64-bit) (cohort: Clang-64)
Windows 10 Enterprise Version 1607 Build 14393.1770
NVDA 2017.3
JAWS 2018.1710.42 private preview release

I am resolving this issue as WontFix because I can't replicate it. 

Report from a user to investigate: 
"The virtual cursor view just disappears randomly. You need to turn the virtual cursor off and turn it back on to be able to read the text. I don’t know if this is a bug in Chrome, Forms, or Jaws."

I tried to repro it using these steps: 
# Create an example form with two questions. One uses a short answer response for an edit field and the other uses a paragraph response for an edit field. 
# Launch JAWS and Chrome Canary
# Navigate to the form 
# Enter a lot of text in the paragraph field, then short answer, then back to paragraph again. Enter at least 60 words.  
# Tab back and forth between these fields quickly adding more text each time.  
# Navigate around the website and your open programs quickly, putting focus onto the Omnibox, other programs open in Windows, and around the submit button. 
# Listen to what is spoken after each transition between states. 
# Repeat with Chrome and NVDA. 

During this time, forms mode turned on and off as expected as I navigated around and the virtual cursor kept reading the content as expected. It also stayed on while typing a lot of text into the paragraph edit field. 

Speculation: one possibility for the user's complaint is that JAWS and NVDA treat the form differently: in JAWS you use the arrow keys to navigate headings while NVDA includes the headings while reading the contents of each edit field.