A common cause for losing an internet connection could be an interruption of power at the interior power outlet (also referred to as a wall wart).
The wall wart on the interior of your home provides power to the exterior CPE. There's a RESET button on the wall wart similar to a GFCI outlet. If there is a power surge, the circuit can trip and cut off power to the CPE. Additionally, check to see if any of the wires connecting to the wall wart have come loose.