Nokia Lumia :: 24-bit Loss-less Files Play With Significant Amount?

I tried converting several lossless FLAC files (192/24) to a lossless WMA (96/24) to listen to on Lumia 920. The conversion went fine and I checked the resulting files by playing them on the computer. They played fine as expected (no difference from the original). However transferred on a 920 those started to exhibit quantization noise and somewhat degraded sound. I don't have extraordinary expectations for the audio hardware in a phone but at times it was very noticeable - the part where a song fades into silence at its end and has prominent quantization noise (intermittent quick patches of noise/faint sound and silence) is a prime example. If the files were played back at 24 bit resolution that wouldn't have happened for sure. Also, perhaps, that wouldn't be noticeable much if there were proper ditering algorithms in place. None of this appears to be happening inside the Lumia's music player or hardware.