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STM32F4 USB VCP problem with timeout when send data from PC to device

Question asked by evgen on Jan 18, 2015
I am use example VCP from the ST. on STM32f405
I am working under WinXP with a virtual COM port via the API as a file.
Cyclically sends data (short packets from 8 to 16 bytes) from PC to Device by function - WriteFile.
Data transfer immediately, but from time to time there is a strange TimeOut to transfer (WriteFile) sometimes up to 500ms.
Same work, but with a real COM port, such delays are not present.
What could be the problem?