We're on our 2nd enlite sensor, new to the 530g. The first one was nearly perfect (and we LOVED it!) -- only a few readings off when our CWD was super high. The second sensor started off ok for 2 days, but now it is just unpredictably off in either direction (sensor was 100 mg/dl under last night and is now giving false lows when we're in range and stable). In a situation like this, is it best to restart the sensor? And if so, do you just "Turn Off Sensor" and then "Reconnect Old Sensor"? Do you need to physically un- and re-connect the transmitter before restarting? Also, I have read about people looking at the ISIG values before calibrating. Can someone shed light on this? They skipped over it in training, assuming it was over everyone's head, I guess? Curious and would love another tool. Thanks in advance!