do an oil change if it doesn't instantly go normal - go back under warranty and get them to fix it
basic reasons it might be playing up - are you running bike spec engine oil (Jaso MA2). On the older bikes with a separate box you could use car oil in the engine - but integral boxes must have oil designed to cope, with additives to reduce the damage the gears do cutting up the molecule chains - and of course a secondary element helps wet plate clutches cope
even with MA2, long drain intervals mean the oil will be heavily worn out - the idea wears the bike out, but it should last enough to get past any warranty claims - do a 4k change and have a better bike, nicer gear changes and help it last longer - aside from deliberately inducing wear it gets "cheaper servicing costs" on the marketing blurb for fools to lap up
if running car oils in a bike box - expect the oil to be well past its best at 500 miles and gear changes to get nasty rough and recalcitrant
note quick shifters usually add a lot of wear and damage vs appropriate use of the throttle and clutch - another trick they have all introduced to sell bikes