If you experience the error code M7121-1331 on your computer, it typically points to a problem with your browser. Using unsupported browsers, such as Speed Browser, can interfere with the player Netflix uses to play TV shows and movies. Follow the troubleshooting steps below to resolve the issue.
Netflix requires the following browser versions to stream successfully.
Google Chrome version 64 or later on Windows 7 or later, Mac OS X 10.10 or later (Mavericks), Chrome OS, or Linux*
Internet Explorer 11 or later on Windows 8.1 or later
Microsoft Edge on Windows 10
Mozilla Firefox version 59 or later on Windows 7 or later or Mac OS X 10.10 or later (Yosemite)
Supported on stable, official release builds from Mozilla. Non-Mozilla builds are not supported.
Opera version 47 or later on Windows 7 or later or Mac OS X 10.10 or later (Yosemite)
Safari on Mac OS X 10.10 or later (Yosemite)
Supported on all 2012 or later models and select 2011 models
*Due to the many configurations of Linux available, customer support is unable to assist with troubleshooting issues on Linux devices.
If you use Chrome, you may want to disable unnecessary add-ons.
In the address bar, enter chrome://extensions.
In the list of extensions, switch off any extensions that are turned on.
Try Netflix again
If these steps solve the problem, try turning on your extensions one by one to see which one is preventing the Netflix website from working properly.