Ezcast Stick Doesn't Work Properly

I can connect my Bq tablet to the Envivo ENV-1409 Miracast Stick, but once connected it's almost impossible to use it. The screen is quite blurry, but the stick supports HD quality. When I move my mouse to the right or left part of the screen, so the Ubuntu bar or the multitask screen pops-up, I can use it properly. But once I'm in an app or on the home screen, the screen just freezes.