The Network problem

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Hi, everybody, this is my first post, I'll try to focus on the problem and be nice. As almost everyone are using the Internet, the conncetion speed is very important. In my case, I have got a huge delay of network transmitting at night(Time Zone +8) I didn't use any software such as BT download tools that take up a lot of network flow, and I am sure that the connection speed is fairly slow at night, but in the morning or afternoon, the speed is normal. I don't know what made this happen, I have no idea how this happen and why, so if anyone know the possible cause of this problem, do tell me. Thanks a lot if you could do some really help.