4k

I have a question regarding what HDMI cable specs are required for the new X1 4k box.  My experience with sports thus far has been poor with washed out colors in particular.  TV adjustments on a Sony OLED don't fix it.  The box had some error codes and was rebooted so maybe a fix.  A tech agent recommended changing to the Xfinity HDMI cables.  My cables are 18 GPS, 4K/60Hz.  Sure work great on apps.