Why is the start/stop button on my Braun coffee grinder is fading?

The unit overheat protection may be active to avoid burning of coffee. Wait until the fading of the start/stop button turns off.

Another potential cause can be that the thermal protector is activated. In this case check if the overheat protection is active. If not, wait a few minutes for it to cool down, unplug and plug in again to restart.