I bought a Kinsa oral thermometer 4 years ago and have loved it unequivocally. When I lost it I ordered a replacement from Amazon.com. I was unable to coordinate it with the Kinsa app previously downloaded onto my phone due to an expired email address in the original app, so I deleted that app and tried to download an app for my new Kinsa. That was unsuccessful. And my new Kinsa thermometer shows a 98.6 on the dial which won’t go away or change - it seems stuck no matter how many times I press the button. My old one would change from Fahrenheit to Centigrade at a push if the button, but this new one does not change at all from the 98.6 which seems to be permanently on the screen; never goes away