I just saw that QQ can be updated, so I updated it. As a result, I couldn't send a message after I went in, but I flashed back after I sent it. What is the reason?

First of all, you can set the repair flash, and it is recommended to download and install the Apple Assistant for quick use. After opening the Quick Use Apple Assistant, connect the ipad, and the Quick Use Apple Assistant has a flashback repair in the upper right corner. If not, you can delete this software and try to reinstall it. If not, you can try to restore the settings, Settings-General-Restore. On the recovery page that opens, try to restore all settings first, and then restart to see if it will flash back. If so, please try to clear all the contents and settings below.