Measuring cell voltage, without a load, makes no sense. Put a small load (20 Ohms e.g.) to the cell when measuring.
Regarding the update loop, it can be caused by empty cells, but there is also a problem with the android app, seems a caching problem. Kill the app completely from the memory (using the task manager, clear the cache), then start the app again.
I’m using my mooshimeter for years now, I run into such problems many times. It’s a very good tool, but it’s still beta, there a many small issues which the user have to know.