This is due to one of two things.

Firstly, your data speed:

If you are using your Mobile Phone need to make sure you are in a good signal area and you have high speed download capability, if not then you will not be able to stream all the data effectively and therefore it won’t be of high quality.

You will find that when you stream through WiFi this will work best as the data should be faster in most circumstances therefore it is advisable to check this as well.

It is important to be aware the large the image (phone vs TV) the more data is required to give you the resolution. When you use the 19” vs the 22” or 32” both the 22” and 32” are full HD 1080 resolution therefore for best quality you need to make sure you have the best data speed coming through the phone or tablet for the 1080 to be functioning. Using the High Resolution also needs more data which means you may use up more of your data plan during this process.

Secondly, the setting on your Netflix or YouTube App:

Ensure that the setting on Video quality changed from Standard to Higher. Again the same will apply that you will not only use more data but if you are downloading the image to the phone or tablet it will take up more space as it requires this for HD Quality.