internet becomes slow or stops working

Intermittent connection issues are very difficult for internet service providers to trouble shoot. The first step in trouble shooing any Intermittent connection problem is to look at the chain of equipment involved in flow of data from the internet service provider to the end user. In most homes the packets enter from the main cable line to the modem, than from the modem to the router, and finally from the router to you computer. So that means that the issue can be caused from the following equipment: main cable line, splitter, modem, router, or the Ethernet / wireless card of the PC. Since we know that the connection is being dropped at or before the modem I recommend contacting the internet service provider and demand a service call to swap the modem and check the pole. Your issue can be cause by some thing as simple as a bad splitter in the home or some thing as complicated at an issue at the pole. Most commonly this will turn out to be a bad modem.

I hope that information above has helped is some way.
If possible please rate this solution.