ibusbk claim interface fail after 32 loops

I'm doing a simple repetitive open/close test using libusb 1.0.19 and libusbk
3.0.7

The target device is a composite device based on CDC/ACM  (2 interface MI0
and MI1) type configuration but with vendor specific class code 

basically what i'm doing 

libusb_open(device, &handle);
libusb_claim_interface(handle,1);

libusb_release_interface(handle,1);
libusb_close(handle);

After 32 loops claim interface will fail with error -3 
this doesn't happen with 3.0.6  thousand loops can be execuetd without any
problem

i'm using win-7 64 

failure occur in both 32/64 bits (mingw32/64) . 




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