Why does my win7 system desktop shortcut icon suddenly disappear some

The desktop icon has always been the most used place in the computer we use. Whether it is to open the software or find something, everyone is used to open it through the desktop shortcut icon, which makes us more convenient when using the computer. But a friend asked me that his computer disappeared some icons for no reason, of course, he did not know what to disappear.
1
Description of the disappearance of the desktop icon:
Because he is effective, the shortcut of the software will produce one to the desktop, his desktop shortcut is very much, there should be more than 60, so disappear He didn't know anything, but he was sure that no one had ever touched his computer, and he hadn't moved the desktop shortcut recently.
2
The reason for disappearing:
This is because the win7 system comes with a function. When the win7 system detects that your desktop shortcut has more than 4 invalid icons, it will automatically delete these invalid icons. .
3
How invalid icons are generated
A lot of us manually click on the production shortcuts in the software. When we delete the software, the desktop shortcuts usually do not follow. At this time, the shortcut to the desktop is an invalid icon.
The above is about why my win7 system desktop shortcut icon will suddenly disappear. This feature personally feels very easy to use, especially for those who are used to the desktop. Knowing the reasons for disappearing will do.