Swanky- While I haven't used the C Booster, I clearly haven't had this problem, but I can offer some advice.
The first Philosophy product I used was The Present, after 7 months it started separating and leaving a white residue on my face. So I emailed Philosophy and they told me to mail it back to them (I couldn't return to Sephora, as it was a gift), so they could analyze it and determine if it was a bad batch. So, I mailed it back, and they mailed me a new one with a very gracious apology note. Ever since then, I've been hooked on Philosophy. The replacement worked far better than the original and I had no issues with it.
I'd shoot them an email and explain your problem.