Can't fill in fillable pdf form on Adobe Acrobat Pro DC - stops responding and shuts down

I have a user who is using Windows 10/Office 2016 environment and has been downloading fillable pdf forms from government website for some time without issue.  Suddenly, she is unable to fill in a pdf form.  She starts filling it in and on the 2nd or 3rd field, Adobe stops responding and she gets error message "Adobe Acrobat DC has stopped working.  A problem caused the program to stop working correctly.  Windows will close the program and notify you if a solution is available."  Only option is to close program.