Google APS synchronisation for contact is now broken

Google APS synchronisation for contact is now broken

Hello,

I had a very positive experience of synchronisation between contact of my Google Apps account and Zoho CRM.
I have been trying for one month to get it to work again : no contact are moving anymore from or to Google Apps.
I have reinitialize the link, changed parameter with no success.
What should I do to make it work.

Thanks in advance ,
Luc