Internet Slowing down sometimes when other devices connect.?

Sometimes when im playing a game like league of legends, other people visit and they automatically connect to the internet with their phones since they have been here before and I gave them the wifi password. When that happens, my connection to the game completely drops, unable to play since its a online... show more Sometimes when im playing a game like league of legends, other people visit and they automatically connect to the internet with their phones since they have been here before and I gave them the wifi password. When that happens, my connection to the game completely drops, unable to play since its a online multiplayer game and it just attempts to reconnect. I either turn off my Iphone 6s wifi off to have the internet working about but sometimes I have to turn multiple devices wifi off. All the phones are being unused and it still affects the wifi. My internet specs are 25Mbps down and 2Mbps. Is there anyways to fix this?
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