Talking to ISP: "...the only time the connection works is on saturday morning, in the evening every other day is crap!" after a minute or so, the ISP: "We will have to send a technician, is saturday morning all right for you?"
Everytime I call the ISP and if that is a girl answering...
Me: 3 green lights 1 yellow, usually that's 4 green.
ISP: Try shutting down the modem for...
Me: Did it.
ISP: Try shutting down the rout...
Me: Did it. Is your nearby server okay? That yellow light means it fails to dial the WAN.
ISP: ...