there are other reasons.
1. Tencent will issue a notice to inform the system maintenance.
2. If it is not system maintenance, then you need to open QQ and click on your profile. Next to the personalized signature, there is a "Save personalized signature to space".
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signature
1. Stay with me. I don't want to make you happy, but because I am happy.
2. Children's world is only understood by children. Our time, only our memories.
3. When you love someone, you only see the other person's advantages in your eyes, not the shortcomings, but you don't mind.
4. Let's welcome the warm spring with open arms.
5. We used to have no mobile phone, no computer and no wifi. At that time, we were happier than now.
6. Sad memories are so profound.