"A few hours ago Niantic increased the scan refresh time on their API from 5 seconds to 10 seconds, doubling the time required to scan for new Pokemon in the area. This slows down 3rd party tracking apps, and breaks any that do not update to this new standard (the apps miss Pokemon if they scan on a smaller timescale)."
https://www.reddit.com/r/pokemongo/c...rate_to_break/