Bad update?

I have had my alivecor for a little over a year and havent had any problems using it on my iphone5 or my 3rd generation iPad, until the app update. Now it has a hard time picking up my finger contact. And when it does, it says it cant categorize the rhythm when its clearly NSR or afib. I have read EKGs for over 30 years. Its clear to me what it is. Could this be a glitch in the upgrade? I changed the battery and cleaned it off. No change.

myislnd about Kardia