In an official statement sent to Cord Cutters News Roku said, “There have been some reports of fans that are louder than expected. We encourage these customers to contact Roku customer support to determine if the player is performing as expected.”
Roku went on to say, “there are only a few cases and of course we are working with these customers with affected players to exchange their players.”
If you have a Roku 4 that is making a loud fan noise you can contact Roku at 1-888-600-7658 (ROKU).
From our own testing we found the Roku 4 to be quiet even after hours of use. The Roku 4 does get warm in a similar way that all the older Rokus heated up. We tested the Roku 4 with six hours of WatchESPN streaming last Saturday and had no noticeable fan noise.
You can see in this video that the Roku 4 was quiet after three hours of constant use.
So if you have a loud Roku 4 you should contact Roku.