If a video is not being delivered fast enough to keep up with the rate it's being viewed, it will cause the video to stop playing until the stream is able to download (or buffer) enough data.
How to stop buffering
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Turn the device off and turn it back on: Rebooting your PC or device could be the fresh start your system needs to get back on track if the issue is resources.
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Lower the video quality to standard definition (SD): if all else fails, lower the video quality of your stream to get things moving more quickly. In Digital Samba, you can disable HD video using the toggle on the top-right of your screen when in a session.
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Disconnect other devices from the network: Is someone else watching Netflix at your place? This could be consuming a lot of bandwidth. For other devices: either put them in airplane mode or turn them off. This is something you should be especially conscious of if your internet speed is 25 Mbps or slower.
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Reboot your router or switch it to 5GHz: If your modem/router is using 2.4 GHz frequency instead of 5 GHz, the signal will travel farther, but it will be slower, which could be causing buffering problems. Keep your router close to your primary streaming devices and use 5 GHz for the best experience.
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Turn off other applications that might be running in the background: make sure there are no downloads happening while streaming. It’s also a good idea to close any other programs or apps if you’re streaming on a computer or phone. Other issues such as your operating system (i.e., Windows) downloading an update could be taking up bandwidth.
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Delete your browser cache and temporary files: if you’re on a laptop and streaming through your web browser, clearing the cache and other temporary files can clean out some gunk and may help speed things up. In Google Chrome, you can find this option under Settings > Advanced Settings.