I was just told by Dexcom support that sensor failures are usually caused by the user

Use this link and submit a tech request. Sensor mishaps happen - within a few days a new sensor is on its way to you. You don’t even have to call


This is how it goes with me to, just like your screenshot. It’s not an issue with adhesive and no amount of calibrating corrects it, it’s obvious the sensor itself is bad. This is how a sensor used to start acting around day 20 and you would know it’s about to go, now it happens anywhere from day 6-10.

Could be an issue with our chemistry, but that doesn’t explain why it’s happening to quite a few people lately but who knows. My guess is Dexcom noticed that a lot of people were restarting sensors and making them last 20-30 days so they started using less of the enzymic material on the sensor wire in an attempt to stop making them last so long, but again, who knows.


That makes great sense to me. I bet you’re right! The sensors don’t last like they used to.

I have previously done restarts and built up an emergency supply as a result. (Restarts usually only are good for a couple days now, so not really worth the bother).

Also sensors that fail after five or six days get replaced by ones that go the full ten days. So for a while I didn’t bother complaining about sensors that didn’t stick because the adhesive curled up underneath, or “failed to launch” or died early. I just used my backup supply.

But now I do request replacements because I don’t want to end up short.


I never have any issue with the adhesive but do, from time to time, have the same “drop out” pattern you are experiencing. Although replacing the sensor at day 7 is my go-to method of dealing with this issue, this problem ONLY happens to me as I approach the end of transmitter life. After the transmitter has been used for more than 90 days, I always start to have these same drop outs.

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Not me, I can have this problem from day 1 to 90 of a transmitter.


Maybe I should do that - go to Costco.

I’m not trying to be the stereotypical Minnesota who believes everything is a result of the weather. We get a little ‘witchcraft-y’ and superstitious about the weather here. But the cold breaks everything here - gas pumps stop working. I’ve had insulin pumps break from working outside in the cold. It breaks stuff.

Sounds like Texas for a different reason heat and sun. Also for all of us diabetics we tend to blame everything ill feeling on diabetes🤠



Weather is relative: have friends that live in Britt, MN (about 90 minutes north of Duluth in the Iron Range) that consider Minneapolis the BALMY part of the state …

Nonetheless, I agree with you: cold is a formidable enemy: insulin freezes (easily in exposed pump tubing), battery life drops precipitously, etc.

The only saving grace: while your G6 transmitter may get a bit cold, the actual business end of a sensor likely stays pretty close to 37 C (98.6 F) even on a cold Minnesota afternoon.

So says the man currently sitting in Coronado, CA (near Sa Diego) where we whine like babies if the daytime high is colder than 65 F or higher than 75 F.

May all you G6 sensors last 10 days …



Lately, the Dexcom web site form has had a programming error. For the last 10 days it would not allow me to enter “City” or “Zip code” and therefore the form would not submit (not from any OS platform). So that means calling tech support. I’ve had three failures in the last month. Both the web site and sensor errors are aggravating. Service is terrible. When the sensors work they are fantastic…but even with insurance the cost is high for a failure. I always insist on replacements with the hope someone at Dexcom will look into quality assurance. It would be nice to have a working website form too.
Dexcom Support Form


I believe that you experienced a problem but there is very little 'programming" in a web form that would prevent data entry and it’s all executed by the browser. The heavy processing happens after the form is completed and submitted.

Most often a problem like that is resolved by clearing the history of the browser.

Since I started using the G6 in April 2022 I’ve had four “sensor failures” two soon after starting.

I was very careful about testing sites because I havr had problems with MDI for years where injections would work in well some areas and not in others.

Since I started using in a infusion site map and very carefully locate sensors only in abdominal sites where infusion has proven to work well the failures have nearly stopped. With my sensors covered by insurance I haven’t tried extending their use, but I haven’t seen a degradation of performance within 10 days.

To the contrary, I have seen an improvement in accuracy that takes up to 3 days to be good enough for my dosing decisions, but part of that is because I’m an outlier, trying to maintain unusually low TIR and SD.

I do a lot more fingerstick testing that is strictly required. I can afford it out of pocket. It’s not expensive unless you use the overpriced heavily advertised US brand first tier strips. The accuracy of those strips is no better than strips that cost 1/4 of what they do., The difference is an order of magnitude larger than the cost of test solutions.
(The largest manufacturer of BG test strips in the world and the largest manufacturer of meters are in Taiwan and they are the major suppliers to the world.)


If you were able to successfully submit a form in the last few weeks, please advise as to the browser and operating system used.

Even after clearing cache, cookies, etc., rebooting assorted devices, disabling tracking blockers, trying 5 different web browsers over 4 different operating systems (Android, iOS, Windows, Linux), the fields ‘City’ and ‘Zip Code’ do not accept input. (At least not from me.) Perhaps they see my customer number and block me because they have tired of my many sensors that go wonky after about 5 days. :rofl:

As a programmer, network engineer, and web developer, i say with confidence that there is indeed “programming” and logic embedded in forms. From assigning valid entries that are able to be typed (numbers only in a phone number section or zip code) to allowing one variable to be input only after a second variable has been input to error checking (have you ever completed an on-line form only to find it could not submit because you missed a radio or checkbox?) there is quite definitely programming within the form. At one time Dexcom forms would not submit unless one included the country code in the phone number, although that requirement was not explicitly stated. After many complaints from many customers, Dexcom modified the required input on the form.


For me your #1 state doesn’t fit. I can’t go by how I feeling to recalibrate. Years ago I stop feeling high or low. That’s way Dexcom was a god send

#2 You don’t need a third party patch. Dexcom will gladly send you a package of ten FREE. SENCE I SWIM I ALSO USE TEGADERM Film to cover the sensor


This past month, June and July, three sensors have failed and I think that a fourth is beginning to fail. The display on my iphone states: “Sensor error…Wait up to 3 hours.” An hour following the last sensor reading at 0800 hrs, another reading displayed at 0855. I’ll keep y’all posted.

And yes, the graphical reading on my iphone displays hiccuping, alternate ups and downs, indicating an imminent failure.

(EDIT) I just informed Dexcom about this morning’s issue and they’re sending me a replacement sensor, the fourth replacement in about 5 weeks. HAT’S OFF TO DEXCOM for their product support.


I’m wondering if these recent failures are with the G6 or G7. I had a G7 fail in beginning of the month, but Dexcom sent me a new one.

I’ve been wearing the G7 a few months now. I am surprised that I lose contact sometimes when my phone is in my pocket on other side of where G7 is placed. That never happened with the G6.

I think that might be from incorporating the transmitter with the sensor. I suspect the G7 transmitter has weaker Bluetooth signal strength.

G6 for me. And tomorrow I’ll be on the fifth sensor in four weeks. These sensors imo have truly gone to h*** (stars my own).

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I can’t speak for anyone else but since I’ve experienced both sensor and infusion site problems in the same locations I know that my sensor problems are more likely caused by my sites than equipment failure.

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Dexcom offered me free receiver if i upgraded to G7. Guess they got tired of 50 to 70% of sensors failing! :joy:

Last month (6/23) began using G7. Guess what? The first 2 failed! :pensive: First had sensor comm failures. Second sent alarm that BG was way too low. Fingerstick said otherwise - wrong by 70 pts. Have had to recalibrate each day.

Two out the the three sensors have failed me over the past three weeks. I am losing faith in Dexcom.

I’ve been using Dexcom G5 and now G6 for about 5 years. Its been my experience that (a) the premature sensor failures come in waves. Different lots seem to have varying quality. So try a sensor ftom a different lot if possible. And (b) Dexcom never balks about sending a replacement for a sensor or transmitter that failed prematurely.

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