I did have a few occlusion alerts with the Snap pump, but it was able to recover from those without much of a problem most of the time -- when it wasn't, have to change out the set and was usually satisfied that the occlusion was real. using the Vibe now, and have only had two occlusions so far. One that resulted in an alert (and had to change out the set), the other did NOT trigger an alert, and my BG sky-rocketed! Then again, I also had a couple occlusions when using the Omnipod -- and there, there IS no fix other than changing the whole thing out.
I use Apidra, which I believe is more prone to crystalization and, therefore, to occlusions. Don't know what would happen if I were using Novolog.