Emails not attaching to contacts

Emails not attaching to contacts

I have been using Zoho CRM and Zoho Mail in conjunction with Google Apps for a little more than six months.  I have used inboxes in gmail, CRM and Mail with no issues.  About 4 days ago all emails stopped associating with contact records.  I made no changes that I am aware of.

Emails continue to flow into all the inboxes but are not associating to contacts.  What can I do to fix this?

John Tytus