Receiver displays ? instead of BG number

btw I was wearing the sensor on my upper butt. With the new one I rather put it in the “official” abdomen area, although I can hardly find there a place with some fat to put it on…

That is my problem too. Right now, I’m wearing a sensor that was ??? as soon as it got thru the initial start up period. Just around the back of my body, above the beltline, works best for me but only on my right side, as I always sleep on my left side and it seems to get in the way. Today, I put in a new sensor more towards the front of my left side, above the beltline. As soon as I did a slight side bend, I realized the location could have been a mistake. I felt a poke, like the needle was hitting my lateral ab muscles. I was ??? free for about an hour, then felt the poke again and sure enough the ??? returned. Going to try to wait the full 3 hours if necessary to see if it comes back but I’m afraid the placement was a bad choice and I’m gonna have to waste this sensor. It ain’t easy being a CGM user who’s petite without alot of fat!