A coworker whom I chat with sometimes in our breakroom asked me this the other day. I told her, and she said, "Oh, I had to ask, because I couldn't place your accent."
It's very rare that someone hears an accent when I speak, so I mentioned that usually some people hear it, and others don't. She said, "Oh, I can definitely hear it."
A few days later, in talking to another coworker, I detected a Spanish accent in my voice. As far as I know, this is a new development. which is cool with me, I dig accents. I'm just wondering where this came from all of a sudden!