Check permanent error signal cables in spite of new and expensive cables

Bought in order to see Amazon Prime videos online the device. Television is a very good Samsung Tv. Unfortunately, the Sony unit has done from the beginning difficulties. Constantly the error message Check Signal Cable came and I could therefore see no movies. Have tested 3 new cable. Even very expensive. Nevertheless, kept coming back for no apparent reason, the same error message. One evening it works and the next day not. Although nothing has been changed. So unit returned. Amazon has it withdrawn smoothly thanks God. I then ordered me a player of Samsung and behold: no problems. Everything works as it should. Sony I can not recommend