After about a week of feeling really good about my blood sugar levels -- 90+% time in range, no huge spikes -- suddenly yesterday I kept spiking up to 16/17 and got down to 46% time in range. Measured on Libre 2 but also confirmed via blood pricks. I haven't seen numbers that high in months but haven't changed anything. I do a fair amount of regular exercise and haven't changed insulin or ratios for a few months. Twice these spikes were well after meals, and as I shouldn't have had any insulin on board I took some correction insulin. The first time I also went for a walk and had a mild hypo, then a more severe one later. With BG of 14 before bed (and I thought no insulin on board) I took two units. I was told that my correction factor is one unit for 2.8 so this should have lowered me to a safe level, which has happened before. But 1.5 hours later I was at 3mmol! I'm just so confused because every time I feel like I have a good week something like this happens and feels so frustrating. I don't think it's anything I've done wrong or differently, but I'm open to hear anyone's suggestions or ideas because otherwise I really don't know what to do in these situations. Thank you!