Please try the following:

Confirm your data connection speed by going to Click on the Begin Test button and compare your results to our system requirements. Restarting your modem can improve temporary connection problems. If the issue still persists, close any other programs that you don’t need open, particularly, bandwidth-intensive applications such as watching video, downloading media, online gaming or video calling services. Similarly, if there are other devices on your network running data-intensive applications, it could impact the quality of playback.