Since it is only the last few times it sounds to me like something you're using that is new to the equation, and doesn't agree with your skin. Sounds like you've thought of that. I'd give it a rest for a couple of days if it is possible. Then try again with a combination of kit that you've used in the past with no problems. If it is good with that, next shave add one of the new additions in to it, but only the one. Keep that up until you isolate what is disagreeing with your skin.