The iPads and phones have all seemed to lose the cardav settings and are again asking for passwords every few minutes. Can you help me with this ? I had all the contacts where they would update the phone from our google account
Did you reset the Google account password ? Device will prompt for the Password if the user change the password of the Google Account. It will immediately remove the contacts synced via the CardDav settings.
To avoid this please use App Specific Password instead of account password. Here is the link to know more on how to setup app specific password in Google Accounts.