You could try enabling debug logging on the DNS server, to see why the query is failing and if it's a specific forwarder that is causing the problem.
To enable the logging open the server properties in the DNS console and set the debug logging tab as shown, setting the file path to something that's appropriate for your server:
Then use nslookup to query the site a couple of times and access the webpage.
You will need to disable the debug logging for the log to be flushed to the drive.
Review the log file and see if you get any insights why the query for domain is failing.
Gary.