If you are using a mobile phone, this often happens. The other is that the user has not updated your QQ information. Although you have updated it, his computer has saved the previous one that needs to be updated before it can be synchronized.

If you find this situation during your own login: it must be caused by an abnormality in your QQ. For example, your QQ logs in from different IPs at the same time and repeatedly brings the other party online several times. Forced offline. This will happen. No matter how many times you update your signature, you will eventually return to the one that the QQ software considered normal.

I used to test my friend’s QQ, like this. I was in Beijing and he was in Dalian. I logged in with the same QQ several times, and each time the other party was forced to log off. No matter how I changed the information in it, everything changed. It can't be changed. You can only return to normal by calling QQ customer service to explain the situation.