My DCH-S150 motion detector also suddenly stopped sending audio and text notifications this week. I see I am not the only one. This isn't the first time it has happened. I opened a support ticket and within minutes (after days of it not working), it started working again. I STRONGLY suspect this is a server-side reset issue. I tried getting DLINK to verify this - it is awful for those that went away on vacation over the holiday to have lost these alerts - exposing their homes and valuables as a result - DLINK, THIS IS NOT ACCEPTABLE!. Fix it permanently! Get some real I/T skilled people and put some monitoring software on your servers like all other responsible service providers!