I do have Fastweb as a provider, but that doesn't seem to be the issue (just asked an LS mate, same problems, different provider.)

I'm on Shiva (Chaos Data Center), times in which these issues occur are pretty much random, or I haven't noticed a pattern tbh. In the morning I usually don't have them, atm I'm ingame and had a few issues upon login, but it seems better now. Hope SE can find whatever is causing this and fix it. What did the provider tell you when you called? Every other device in the house works fine, so I don't think ISP is causing this :/