I agree with R and Woody. Take the vehicle in, and get it documented.
It's very important.
Here is an example:
I have a '99 GMC Jimmy. The engine developed an acceleration rattle
noise at about 25k miles. I complained about it many times (documented),
before the warranty was out. There was no fix at that time. GM said it was
normal. When my truck had 68,000 miles on it, GM came out with a bulletin
that would fix the problem. To make a long story short, I went back, stuck
to my guns about the problem, and they fixed it, at 68k miles (About $800+
worth of work/parts). All I had to do, was pay the tax.
Your case is not this extreme, but get it documented.
Hope this helps,