Engine hesitation in 2nd gear when rolling on throttle.


I have '12 busa with about 1500 miles. It had the first oil change. It started about a week ago. It accelerates fine in 1st gear. After shifting into 2nd gear, giving it gas, the bike hesitates for a second. It feels almost as if the power cuts out then comes back when I let off the throttle a bit. This happened early on during my ride. It doesn't seem to be happening after riding a while. Any idea what might be causing this? The bike has extended warranty. I will take it in if it worsens or persists. Thanks
Strange on a brand new bike... Any mods at all? Electrical or mechanical?