I've gone through periods of a day or two when my usual juice stops having TH and the flavor isn't as strong. And then suddenly, TH and flavor are back. Pretty weird, I don't know what to make of it. I'm just glad it gets better. Perhaps if you give it a little time it will get better. If not, you may want to consider vaping at 5V. I don't know what PV you're using now but it may be time to step it up a notch.
I used a 510 for about a month and the batts really started getting to me. I got a Tornado and not only does the battery last 2 days but the flavor and TH were significantly improved. If you're a 510 user, I would highly recommend an Ego or Tornado battery. And for the best possible TH, dripping is a MUST!