I changed to the upper buttocks, and seem to be doing better. Thanks for the comments and advice.
..could happen if your insertion site is too close to one recently used ..I have taken insulin injections now for over 47 years and have so much scar tissue finding a site that will accept infusion is a big problem ..I recently changed infusion sets (Paradigm) to ones with a "long" metal insertion needle rather than the shorter variety ..this, along with moving insertion sites to previously untried places on my abdomen and sides has helped a great deal ..hope you find this relevant
We're volunteers, not docs, so it's hard to give a medical answer for why that might be happening. You should check with your doctor about whether it's a site issue or not.
My daughter is just getting ready to go on the pump, and her doctor insisted that she not use the stomach area as the site-- she had her practice with it on the upper buttocks, and said it's more comfortable and easier there. She did, in fact, find it unobtrusive and comfortable.
Good luck solving this puzzle.