Just over 3 weeks in, and we are having similar issues with #2's pump. The technology is fantastic - she loves not having to inject 4 or 5 times day and also the new found freedom that it is giving her - yesterday she went to McDonald's for lunch with her friends (a rare treat in the Rolfe household, McDonalds is generally to be avoided), unchaperoned. Bolus doses were administered directly onto the pump and her BGL was pretty well controlled as a result. The misconception I had made was that the pump would make things easier. I was wrong - the pump enables far tighter control of #2's BGL, and there are all sorts of terrific things it does (we recently received a blood glucose monitor that syncs direct to the pump via bluetooth - blood still needs to be drawn, but this is definitely a clever piece of kit), but there are downsides.
Last weekend, #2's BGL was through the roof - at one point over 20. We replaced the cannula, removing one which had become bent and therefore insulin was not being administered. A day later and the same thing happened again. It was only on the 3rd attempt that we got a successful insertion and her BGL came back to normal within a few hours. Next time we'll know what to do and resolve things a lot more quickly. The other issue is that of monitoring levels - the pump is a computer, and computers can go wrong. BGLs need to be monitored in case it has broken. This is also true in the night, although we are becoming a little more relaxed with the way her BGL trends overnight, and are no longer getting up at 3am every day, just some days depending on her BGL at around 10.30/11 - the last check of the day.
We have been making use of contacts made with Diabetes specialists that we met on the Diabetes UK Care Weekend, for advice and just to bounce ideas off. They have also provided us very kindly with lots of educational literature on the pump. For that we are extremely grateful.
In this respect, both Garmin Fenix and pump are amazingly powerful pieces of kit. I would not be surprised if someone told me there was more processing power than in the 1969 moon landings in both! There is definitely a bedding in process required, and that I guess is a "time" thing.