Is your internet working when this happens? It is normal for the light to go on and off meaning that there is a transfer of information between the modem and the servers if your services cut when the light go out you might have a problem with either the signal or the modem itself.
Like I said if the light flash but internet works = it is normal.
If your services cut start by unplugging and replugging the power cable from the modem, if that doesnt work contact the support team since it could be a connection problem.
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