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reliability of OTG USB on stm32f4 Disco

Question asked by mouser on Sep 7, 2015
Latest reply on Oct 26, 2015 by mouser
 I am intending to port GRBL Gcode interpreter to run on stm32f4 discovery and I have seen several reports that the OTG USB port ( more specifically the provided ST firmware ) is not reliable.

A colleague in the UK working with audio synth could not get reliable data transfer and moved to using USART where it worked as designed.

A partial port of GRBL to STM32 found similar reliability issues and adopted a similar solution.

Is this a known issue, is this the right place to raise it ?