Клик на название графика включает/выключает его. "-Дельта" - графики скорости изменения, единиц в минуту.
Every 40 minutes the connection disappears. Nothing was connected to the box neither via cable nor via Wi-Fi. This is the second router with the same behaviour. The recording started at circa 03:56:15 CET, in 2 minutes the connection dissapeared.