Our map data comes from the OpenStreetMap project, which has excellent coverage in many locations, but less good in other places. You can check the maps on their website to check the coverage detail of an area. If there are missing street names it probably due to this fact, but fortunately this is a community project and improving every day! If you find that PocketEarth lacks detail that is available on the OSM website, please report it and we will be happy to investigate.
We are very sorry about the crashing issue during searching, please see this forum post for more details.