A month or two before xmas I got 4 boxes from Medtronic. First box was fine, second box had 4 failures (out of the 10) and the third box has had 3 out of 4 fail on me.
Failures are always insulin leaking somewhere after the end of the tubing, the insulin just comes flooding out rather than in. Set removed shows no kink in the cannula, and the site itself seems fine (no lumps or spewing stuff out.)
I’ve not changed my style nor my site placement strategy so I don’t think that’s at fault.
I’d moved onto the fourth box which has a different expiry date so hopefully a different batch.