What is your application? why are you changing the data_gen_stream_in value?
There should not be any issue, even though if you change it.
Share the screen shots of the streamer when the failure happens?
Have you enabled Debug Prints, if yes, share them too?
If you have any USB Hardware Analyzer, please take the trace and share with us.If you don't have, you can get the same trace with software Analyzer (Bus Hound ).BTW, What is the firmware that you used here? Have you done any modifications to project provided with AN65974?Regards,Srdr