"suggestd quit unexpectedly" means what? What does the alert box statement "suggestd quit unexpectedly" mean?  It turned up on my iMac , OS Sierra 10.12.  I have attached a screenshot.
Try deleting the ~/Library/Suggestions and restarting your Mac.

Using terminal:

mv ~/Library/Suggestion ~/.Trash


This will move it to the trash incase you want to revert back.

Reboot your Mac and it should begin working.