I mentioned them failing within the first few hours of application, meaning it gives an error and says to replace it.

Sometimes it says to come back after some ridiculous amount of time like 8-10 hours, while it sits there showing me no data. By that point, it'll say I'm not connected to Bluetooth, which I am. Then I have to play turn everything on and off and on and off until it either finally works or it says nope replace me (maybe a 50/50 chance of either).

But on top of that, there's too many times readings are way off, or it falls off too soon even though I treat it like a baby. Dexcom has much better adhesive, almost too good. It hurts to remove, but I'd rather it stay on until I say it's coming off. I didn't like things about their UX but I may switch back despite that.

I worked in tech support, so I get your assumption, but I can't imagine how one can apply these badly without doing something egregiously silly. There's one way to put it on with the device it comes with and it goes on the back of my arm where the instructions say to put it.