I recently started using WhatsApp Fingerprint lock. the first few hours it was all fine. but suddenly even after confirming the fingerprint the icon stays active inside the WhatsApp and when i touch the icon it lights up and nothing happens. however when the next time i open whatsapp and the fingerprint icon appears it doesn't work and even after going back to home screen the icon stays present. i have to force stop the WhatsApp and try again to make it work. i hope this can be fixed. i want to confirm similar issue can be noticed in "Citibank App" as well.