Why does my phone say my wifi connection is limited?

[Windows Central Question]

I got my new Lumia 635 and was working smoothly with my wifi and everything, then suddenly just says that the connection is limited, but the router keeps sending normal internet while connected to the pc, and i started to think that it was a wireless problem but now my sister came from a trip and uses her iphone with the wifi as normal as ever, while my nokia keeps saying about "limited" connection.. what can i do?