First, I'd take it on a good 15 minute ride to insure it's fully warmed-up, especially if you live in a place where it's cold outside.
If it still does it after 15 minutes, than you can try tweaking the settings via the buttons.
I forget what I used on my WR-250R with the Power Programmer, but if you search my old posts, you can find them.
They worked very well on my bike, with zero hesitation.
But first, ride the bike long enough to get it up to temperature.