sound problem in 6.0.5.41290 version

Hu there! Have got a problem with AAC codec in the newest Nx version: when the sampling frequency is 16 or 32 kHz and bit rate of the audio stream 32 k - all is ok, but when the sampling frequency is 48 kHz with the same bitrate - the sound starts to interrupt frequently. Can you help with this?

BR, V.