Sometimes this problem has arisen for a brief while with Chrome browser, but not with Firefox and Edge browsers. So, whenever you have such an issue again with an ISC feature, you could try accessing the feature with a browser other than the one you used to access it.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease