Zoho Books replication ongoing fails on 2 tables

Zoho Books replication ongoing fails on 2 tables

Hi guys, 

I've had 2 tables withing the Zoho Books connection continually failing for several weeks now. These are: 
  1. Contacts
  2. Purchase Orders
The error received is: Integration failed: For security reasons you have been blocked for some time as you have exceeded the maximum number of requests per minute.

But this does not make sense if the other queries are working...?