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Check your router, I've seen something like this when a friend of mine bought a brand new Netgear router, and he had to mount it in his new apartment, but it took him too much time as he did not know what he should do. As far as I know, he faced some issues with the DNS server and this stopped his internet traffic, more than that he got disconnected for a couple of times. Both of us were searching for a solution for this issue and the best we could find was an article about What Is A DNS Server. To cut it short, we were able to solve this issue and to fix it easily, if there are other people that are facing the same issue, you know what can help you now