I have been having some connectivity issue with my Motorola SB5101 modem. Fortunately it happens mostly during the summer, where for some reason the modem would restart itself and the light would be stop and blinks on the "Send" light. The "Power" and "Receive" lights are the only two lights that stays fully illuminated. However when it hits down to the "Send" light it gets stuck there and stays there continuously blinking until it restarts itself once again. The rest of the lights underneath it (the "Online" & "Activity" lights) never gets a chance to turn on. This occurrence is very spontaneous, where it very unpredictable which makes it difficult to call for a service repairman when the appointment won't be til the next day. I have call Charter Communications multiple times where they seem to be unable to connect to the modem. It been working fine mostly throughout the year, but when it hits the summer abnormality happens, and it have been happening for many summers now. I have tried turning everything off for 30 seconds and sometimes it works and others doesn't. It just seems it wants to work again only when it wants to.