Hi, this sort of behaviour I quite common at this age as LOs gets more active and more alert. It might be because this kind of swaddle is too restrictive for him now and he's getting worked up about it. You could try a zip up swaddle like a woombie (I can't remember when we moved to one of these but not long after 7 weeks I'm sure) it still keeps LOs wrapped up and stopped my dd hitting herself in the face, but they do have some movement freedom which stopped my DD's frustration.
Another thing it could be is that your DS is starting to need a tiny bit longer A time before he is put down for the nap, perhaps he's not quite tired enough. How long is your A time right now? Could you add 5/10 mins to each and see if that helps?