Why does the Survey Question on the Recurring Survey Target record default to "None" instead of the previously selected answer when the User selects "Update Response"?
A possible reason for a Survey Question to default to "None" instead of the previously selected answer after selecting the "Update Response" button on a Recurring Survey Target record is that the Answer_Choice_vod__c value on the Survey Question record has been updated.
This field contains a concatenated list of all the possible Answer choices for the Survey Question. If it has been modified to add additional choices after the User initially answered the Question, then when a User attempts to update the Survey Target record response, the Question Response will default to "None".
To resolve this, you can remove the Answer_Choice_vod__c value or values that were added after the initial User response was captured. After removing the new Answer Choice value(s), Users will not see this option on the Survey Target record and the question will no longer default to the "--None--" option when selecting the "Update Response" button.
If Users have already submitted the new Survey Target record with the updated Survey Question, Admins can review the previously created Survey Target records and look back for the first response prior to any with "None" as the Answer value.
Help Documentation: Creating Survey Questions