I don't really have advice, but just want to tell you that my 20wk old DD goes through stages like this every 2 weeks or so! (Possible exaggeration, just feels like as soon as things go back to normal, it begins again) Am yet to figure out the reasons, I'm starting to think it's just a baby thing.
The trick is not to worry too much and ride it out, it always goes back to normal.

One theory could be a slow letdown? Coz I think sometimes babies are more impatient some days than other. I have found that wearing a tight singlet, and pulling it up over boobs when feeding helps to compress and make it come a lot faster. And then if it seems to be too fast, I just wedge my hand in to reduce the tightness of the singlet, IYKWIM?

Hope this helps! Regardless, don't stress, these things seem to just resolve on their own.