Only happens on yono app? Try reinstalling the app also try restarting, if that doesn't fix then try resetting your phone, if that to doesn't fix it then visit service centre.
We acknowledge your query and apologize for the same. We request that you kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
