^^^ I agree they are gorgeous. Just a thought if you have recently changed to a flowering regimen of nutes and I am guessing you have. The plant may be adjusting to lower amounts of N and higher P. Either way it does not seem you have a huge issue going on. I would not stop feeding all together, that will cause some issues with 4 weeks of starving. Perhaps cut back your feeding schedule and/or amounts.
Please do not go by just my advice. I love to help growers but I am not a botanist...get some others opinions as well.