If you can provide more detail about what actions cause a crash it would be very helpful, we’ll try to get it fixed.
When the Mooshimeter is connected to the smartphone, it flashes once every time it sends a sample. So that flash is nothing to worry about.
In the scan screen, I still see the link to the help site, but maybe we’re on different platforms. Can you take a screenshot of what you’re seeing and email it to firstname.lastname@example.org? It would help with diagnosis.