Why does QQ automatically send messages?

You should be referring to the automatic sending of messages by the mobile phone.

Generally, there are two situations in which mobile phones automatically send messages

One is that the mobile phone has a virus, and the virus program uses your mobile phone text messages to achieve the purpose of deducting fees.

Second, some games or software on the mobile phone require sending text messages to obtain corresponding permissions to continue playing the game or software.

In both of the above situations, you can set the permission to send text messages through the mobile phone security assistant. Restricting the permission to send text messages has achieved the purpose of restricting the mobile phone from automatically sending text messages inexplicably.