Xbox doesn't turn off - light blinking

Recently, my Xbox One S has stopped turning off properly. I click the button on the console, my TV loses signal from the console, but the light blinks and the fan whirrs indefinitely. So far the only way I've been able to get the console to turn off when
this happens is to disconnect it from power or hold down the button for 10 seconds. Anyone had this problem or found a fix? Any replies would be appreciated lads.

:)