artefacts with AACDecode

[lidense]

Hi I am using your library in a webradio project that decodes aac.
when I use an outSample of 2048X2 there is a crash after AACDecode, if I double outSample size to 2048X4) AACDecode works (is this due to SBR?) but when I play the outSample on my M5StackCore 2 using output->ConsumeSample(lastSample)) in a loop there are small artefacts like fine crackles. If instead as a test I record the outSample on the SD card for a minute or so and then play the file with Audacity (48000Hz, 2 channels, 16bits) the sound is perfect.
Any suggestions?
Thanks