There can be number of reasons that create this trouble and for that first of all check the internet connection, if there is stable signal or not, power connection can also trouble you if the socket is not working or there may power fluctuation that can drop you in this issue. Try to change the router position and its settings too, may be the base station’s firmware required an update, update the firmware to get over the offline issue. Ensure that your base station is not far away from wifi router and also examine the network obstacle to get over the problem.