Problem with connection to certain site

Hi people i need help with this thing it began 1 week ago.

The problem is that in random time i cant connect to sites sutch as google or youtube. After 2 mins i open my browser and i successfuly connect.

I thought it is problem of my network but its not becouse while this happens i can chat trought skype or play any online games with low latency. I have ran anti-virus scans and nothing has been found. Please help me solve this.

Also i was trying to connect with mutliple browsers with same result

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