I've tried a number of slightly different positions on my arm, but all seem to be much of a muchness. I think the way you've described it (about the filament digging in) is probably more accurate actually. Certain movements will cause sharper pains than others. I still need to try placing the senor in more of the anterior chest area rather than the back/side of my arm to see if this has any difference in accuracy or longevity.
Would it still be worth reporting this issue to Abbott and try to get a replacement sensor
@Robin? I'm concerned if this keeps happening then I may be without a sensor for an extended time, as I can only order 2 on my prescription each month.