I have noticed a couple of times recently that the sound I'm hearing for Chinese pronounciation is wrong, although the written pinyin is clearly correct. For example, I just had the word 奉行 and the sound I heard was 'fengding' instead of 'fengxing'. A little over a week ago, I had wrong pronounciation for the word 讲究. I can't remember exactly what it was, but I'm sure it was a change in a consonant sound. Both times, I went back to see whether I just wasn't listening carefully enough and the wrong pronounciation was repeated. I don't know if it happens when the word comes up the next time... i.e. in a few days.
Has anyone else noticed a similar problem?