By default, HDO Box tries to auto-select a resolution based on your internet speed. You can override this:
Ensure you are running the latest version for bug fixes. Troubleshoot Common App Issues Fix HDO Box Issue and Buffering- Video Quality ...
During playback, open the hamburger menu in the top right and select a different server; users on Reddit report this fixes almost all immediate buffering. By default, HDO Box tries to auto-select a
HDO Box is a popular choice for streaming, but performance hiccups can ruin a movie night. If you are dealing with constant loading circles or blurry images, these proven fixes will help you get back to a seamless viewing experience. Resolve Constant Buffering Fix HDO Box Issue and Buffering- Video Quality ...