Problem with multi touch

Hi,

I am having a problem on multitouch on android , i have a script for buttons and i have 4 buttons , the problem is when pressing a button then pressing another key that first touch stops working , i have searched much and have tried many times but I couldn't solve this problem , this is my touch script :

     if(Input.touchCount > 0)
     {
         var touch: Touch = Input.touches[1]; 
 
         if(touch.phase == TouchPhase.Stationary &&   guiTexture.HitTest(touch.position))
         {
             if(Target)
             {
                 Target.SendMessage("Clicked",FunctionNo);
                 guiTexture.color = HoldColor;
             }
         }
         
         if(touch.phase == TouchPhase.Ended && guiTexture.HitTest(touch.position))
         {
             if(Target)
             {
                 Target.SendMessage("Clicked",-FunctionNo);
                 guiTexture.color = NormalColor;
             }
         }
     }

thanks a lot.