Every time the phone is restarted, the Express Card will be closed.

You can try to download and install an ES file browser, which is a commonly used software and should be available in all software markets. Run the ES file browser. Find "Application" in the upper right corner of the homepage of ES file browser, and click Enter. All your software is here. Find the software that is missing the icon and hold it for 3 seconds. The software is selected at this time. Click "More" at the bottom to open the menu. Select "Add to Desktop" in it. The icon is back.

Precautions:

This method is only applicable to the situation that the software still exists but the icon disappears.