If it's hesitating my first thought (as it's the cheapest to replace and easiest to sort out) would be cables. They do this when corroded or not moving freely. So it may just be that.
But as already stated, it's a new set up so you shouldn't be the one having to fix it.
If it's hesitating my first thought (as it's the cheapest to replace and easiest to sort out) would be cables. They do this when corroded or not moving freely. So it may just be that.
But as already stated, it's a new set up so you shouldn't be the one having to fix it.