You may want to provide a few more details. Where are you trying to stream from? (Netflix, Hulu, etc.) Do you still have data left? (If you've used up your broadband you will be throttled and streaming may not work at all). Have you tried turning off, or pausing, the Video Data Saver? Are you trying to stream in HD?
Also please note that congestion can affect your ability to stream. At times of high usage, streaming may be more difficult.
