For brokerages using the Zillow API to display property details and home evaluations, it's important to note there is a pre-set limit to the amount of times Zillow lets users pull information from their API.
Once you reach 1000 calls in a single day, Zillow will block you from accessing their information through their API. If you are experiencing problems related to this call limit, you can submit a request to increase the limit for your brokerage at the link below.
Request a limit increase - https://www.zillow.com/webservice/APIUpgradeRequest.htm
For more information on Zillow's API visit - https://www.zillow.com/howto/api/APITerms.htm