I'm interested in what you find out about this issue, it sounds similar to things I've noticed on mine. Occasionally if I coast holding the clutch, when I get back on the throttle to match revs for whatever gear I'm now in, I get that little pop/backfire. The bike also stalls occasionally the very first time I start moving on some mornings, not sure if that's related...
My issue never got more frequent and I figured it'd be a nightmare troubleshooting it. The dealership said they'd have to charge me if it wasn't found, but then I could be covered beyond the warranty if it ever was... With how infrequent it is I never had it checked out and my warranty just expired.
Best of luck, and I hope we can get some useful information on what seems to be a currently unknown issue.