You are probably having absorption problems at your pump sites, or the insulin in your pump may be spoiling.
Living with type 1 diabetes since 1986.I'm a mom supporting a child with type 1 diabetes since 2005.
FL, United States
There may be a significant difference in your basal insulin on board. Meaning, the lantus you take with a syringe may be less than your basal rate is delivering at a particular time of time, and the balance is made up by your meal bolus.