Ok so this has been happening for a while probably since 1.6 i don't remember exactly how long though. Any ways when im connected to a multiplayer server every 5-20 mins my internet goes out. And this is only on Minecraft but it also affects my web browser not letting me connect to any websites even though it saids my internet is on and working fine. But it lasts forever im pretty sure until i unplug my router and replug it. its very frustrating If you need my computer specs or any thing let me know. Also il give you the error message after it disconnects me from the server
internal exception io.netty.handler.timeout.ReadtimoutException
Also it works fine on tekkit/hexxit servers and possibly other technic launcher mods but those two i know for a fact dont mess it up