I see three possible explanations for the small price decline over the past two weeks:
1) Seasonality (as @Ben pointed out). It's been common the past few years in most cryptocurrencies.
2) Our share price more than tripled from 0.0018 USD to 0.0060 USD in the span of a few weeks, after having no liquidity for months. There are likely a few shareholders looking to liquidate, and they were waiting to see how high the price might go before they needed to start competing. This competition is good for shareholders, because it encourages discounted NSR sales (as we've seen the past two buyback weeks)
3) Not mentioned yet is that the US dollar has increased in value relative to every other currency in the world lately, and this trend will probably continue with the increase in interest rates announced today by the US Fed. I have no proof, but it seems we have a large contingent of shareholders from Europe, Asia, and Australia/New Zealand. For those shareholders, you can add up to 20-30% extra profit on to their NSR, because cashing out to their local currency from USD is very profitable.
Our fundamentals are still very strong and most shareholders recognize it. B&C Exchange is coming soon, new NBT products will be introduced, and overall NBT demand should increase over the next year.