|First, check that your computer's network interface is set to get it's TCP/IP settings automatically (DHCP).|
If it's not, then make it so and see if that doesn't fix the issue.
If it doesn't, get back to us here and let us know if this is a new (to you) router, or one you've had a while and this issue has just popped up.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.