WiFi slows down when other phone connected

[punk999]

So I have noticed every since lollipop update, whenever someone else connects to the router my internet stops loading on Galaxy S5, this did not happen before lollipop, also I own a iPad mini and iPhone 5c and they both work fine as well, so I'm sure the problem it's with the GS5. Please help

 

[Rukbat]

Since the S5 can't know that other devices are connected to the router, it's most likely a problem with how the router is set up. If the S5 is on 5GHz and everything else is on 2.4GHz, and the router turns 5GHz off when 2.4GHz is being used, that would describe your symptoms. (Without being familiar with the particular model router, it's all guesswork. You might have better luck on the PortForward Forum - they're more familiar with more types of routers.)