You might want to see and make sure the dealership put in the right type of oil in your bike. On my last bike, the dealership had put in a common oil that had a special additive that is supposed to coat the engine parts and add an extra layer of lubrication. That's fine and dandy for an engine with a dry clutch, but our motorcycles use a wet sump. So having an extra clingy additive attach itself to parts that work based purely off of friction, being fed from the same oil supply as the engine, will give similar results. As the engine has been running for a bit and the oil has cycled through the engine and transmission, when a sudden surge of power hits the clutch, due to the extra coat of lubrication, it wont be able to maintain friction and will slip until that slight layer is removed or torque drops down below that friction level.
I know it's probably not the case but I'm just throwing that out there just in case. Have had it happen before and apparently it's pretty easy to be done. Many of the premium oils have an extra lube additive that coats and acts as an extra layer of lube. This is absolute nightmare for a wet clutch.