This usually happens between old applications and new systems. For example, if you upgrade to ios8. 1 now, and your mobile phone has not been updated for a long time or there is no compatible ios8 application, you may flash back. The solution is to wait for the application to be updated before installing.

2. The background program is out of memory.

I have to say that iOS is a good optimization system, which is better than Android. But Apple's 1G memory is also very tight, especially when you open many programs. When the background program memory is too large, flashback will occur. Solution: Double-click the Home button to bring up the background and close all applications, and then see if it will flash back. The probability of Apple's mobile phone flashing back due to insufficient memory is very small.

3, prison break to modify files

Some users after jailbreak may have the phenomenon of application flashback. Especially if you have changed the font, the system APP will not be able to open the application according to your font. Solution: Replace a completely compatible font, or switch back to the original font, or simply don't jailbreak.