Few rookie questions about android game development

I have started the game development on android mode for few days but there are two problem that hinder my progress. The first one is my galaxy S5 can seldom connect to my mac with Unity Remote 5, which most of the time fail to connect. The second one is the graphic problem. When I successfully connect my mac and S5, the graphic shown on the mobile screen is ridiculously blur, which like the pictures on the phone were magnified. So how to fix the connection problem and graphic problem? Thx guys and sorry for my poor English

The unity Remote is only a remote that helps you to get the input data like touch gyro and accelerometer into the editor. It shows only a low res reference image from the editor to help you to know what you are touching at. It’s not a bug it’s intentional.
About the connection problem , i have never have done android development on a mac so i can’t say anything about that.