I am having the sand issue. “until I turn it off” I’d no longer an option on my iPhone ring app. I have to manually turn back on every 15 minutes. I called customer service and they said the developers team would look into it - could take 48 hours to update. So strange one day it all just stopped working and defaulted to only 30 seconds, 1 min, 5 min, 15 min as my only options.