Why my Redmi 1s on Mokee 2016.09.02(release) has internet connecti but tells it isn't

Today at morning i installed on my Xiaomi Redmi 1s WCDMA (armani) Mokee 2016.09.02(release). And all was fine. I successfully connected to my home WI-FI and i successfully download few apps from play market. But few hours later when i'm connecting to my WI-FI (i didn't change any setting on my router) my phone tell me that "It's connected, but has no internet". So i'l try to google something and internet connection works properly. Then i run video on Youtube and it too works fine. So question is - why my phone tells me about WI-FI that "It's connected, but has no internet" but internet is and it works.

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