Did you have some bleeding at the site when you took out the set after 12 hours? I’ve found that sometimes I have a bad site and don’t feel any pain and it looks fine, but when I decide to try changing it, there is some bleeding at the insertion site, and if I choose a new site not too far from where it was so I don’t have to peel off the connector piece as well, reinsert the sure t and tape it well, my bg improves. I also discovered that I have the most success when I change sets every two days. So much seems to depend on body type, how many years you’ve been using the areas even when you rotate sites regularly.
But, talk to Medtronic tech support. I have always found them helpful and they have replaced sets for me when I had problems. They ask a ton of questions and will want product lot numbers and as many details as you can give them, so block out some time to make the call.
Wish you good luck. I’ve been diabetic since age ten, over the 50 year mark, on pumps since 1992. Still walkin’ the tightrope…