1. Memory problem: When an application uses too much memory or leaks memory, it may cause the application to crash. This usually happens when the device is out of memory.

2. Application version problem: If the application version is low, the application software will be incompatible, leading to flashback. If the version is too old, update to the new version.

3. Network problems: Some softwares need a stable network, and they use a 2G/3G network, which is easy to cause flashback. It is recommended to play with WiFi.