Just wondering if any parents have tips to make the Dexcom Sensor last longer. My daughter is 5, and she wears her sensor exclusively on her lower back for now (switching side and height each time). I restart the sensor every week when the warning comes up (sometimes before the warning), but it seems that almost exactly on the 7th days the sensor starts to skip BG readings (showing "???" intervals). And pretty much on the 8th day, we just get "???" with no more readings, and we have to change sensor. I read frequently about people easily getting 10+ days of good use. Are we doing something wrong? We use Opsite tape around the sensor to keep it stuck on, so that's not an issue, but for some reason rarely ever get a day or two over 7 days. Any help would be appreciated. Thanks.