BTW this is because the ISP provides a dynamic IP address. Unplugging your modem for a while ( 20 to 30 minutes ) will allow the IP address assigned to yourself to be assigned to another user which means that when you reconnect because that IP address is ow in use you will be assigned another..

If you unplug and plug back in without a gap in time there is a good chance you will simply pick up the same address again