My Macbook cuts off my mother's internet access

It looks like whenever I turn on my computer, and it connects to our internet wi-fi, it cuts off my moms internet. However, the same cannot be said if my mom turned on her computer to access the internet, it doesn't cut off my access.
I am wondering what this problem is?
We are using linksys for our wifi, no password protected, just MAC Address settings.

It sounds like a router problem. For some reason it is always giving your Macbook the same IP address, even if someone else has it. Make sure all computers are using DHCP to obtain IP addresses. Also make sure that the router doesn't have any hard-coded IP addresses assigned to computers.

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