Problems with SMT32F427ZTGx and USB HID

[SAlva.17]

Hello.

I´m using a SMT32F427ZTGx.

I have generated the code with CubeMX and compiled it with Keil 5.

USB communications from the PC to the board work correctly but vice versa no. Some of the messages from the board to the PC are lost. Using a port sniffer tells me that the message is lost by a USBD_STATUS_XACT_ERROR

Can someone help me?

Thank you.