I haven’t had your particular issue with accuracy, but I have had sensor errors requiring me to change the sensor many days under the 10 day expiration. Dexcom tech support really wasn’t a lot of help. They did send me some Over Patches to keep the sensor stable, even though I didn’t think that was the cause. I searched everywhere for answers but @JessicaD here on FUD gave me the best suggestion, Revised view on Dexcom G6. I now wear the sensor on my upper arm, and am on my 3rd sensor with no errors. So placement does indeed make a huge difference. Why, I don’t know!