unstable, doubt the real speed of Internet

[Yuchao_Chen]

every night, the Internet becomes very unstabel, and it will disconnect many times. Besides during the day and night, the Internet has not shown its 50M speed. 

[smith6612]

Since you're saying you're running 50Mbps, are you using FiOS or DSL for your Internet connection? Or, are you looking at the speed of your Wireless connection by chance?