I started using it on Thursday- the first receiver wasn't beeping/alerting properly, so they over nighted me a new one and now I'm having the same problem with the new one- it only beeps when it "feels like it" for alerts, it usually vibrates but just now it didn't even vibrate for a high alert. I already knew from my symptoms I was high so I checked it to find a high alert on the screen.
I also have had a lot of numbers 40-90 points off. Dexcom help told me to calibrate 3x 15 minutes apart when I have numbers over 20 points off. But that means testing 3x!!! each time this happens which seems to be 3x per day at least. It has had long stretches of accuracy, as long as I don't take insulin or especially don't eat anything- that seems to be when it has the most trouble.
Has anyone had this problem with their receiver? I will have to call them again tomorrow. I have had the sensor in for 2-3 days now so it should be more accurate by now. The first night, with the first receiver, it had me in the 40-50s all night, but NO BEEPS or sound alerts of any type, only some vibrations happened. I tested several times in case- I was in the 80's-90's each time.