Leeboy ... I think this is part of why some hear this problem and some, like myself do not. I do not hit the fill "Randomly"!!!
Maybe it's just me but I (use the EC5) hit the fill, most times, at the top of the bar (on the 1st beat) sometimes on the last beat. (4/4 of course)I certainly do not think of myself has having "Exceptional" timing but I never have a problem with this on the Pa2x. Previous Korg arrangers I have had, in particular, the first PA1x ... yes this was a major pain in the A--!!!