R50 not reading driver off tee

  • When im playing and tee the ball up with a black tee that the unit doesn’t read then place the ball on top it reads it. Then I go to hit and it doesn’t read the shot. If I take a slow swing it will read it but when I take a full swing it never reads it. I’m using new Bridgestone golf balls. I e used different tees and balls still the same. Is it the lighting or something else. I have an older RBZ Taylor made white head driver. Any suggestions ate appreciated