It's quite possible that there are a combination of factors behind a series of hypos. It doesn't have to be down to just one trigger to set off a hypo. Extra testing and careful carb counting, so that you get a good idea of the pattern of BS rising and falling over time may help to identify what is happening. Extra attention to rotating sites may improve things. In other words, if you know that you aren't actually doing anything wrong, you can only keep on doing what you're doing, but paying more attention to it. It's possible that a reason may emerge, or the hypos may decrease gradually. If they increase, I'd be on to my DSN and consultant.
We all know this situation is both worrying and frustrating to deal with. Hope things improve. You just have to be careful !