for some reason, three of my pads aren't working now...the last time I used it, I wasn't having this problem, and it's just been sitting there since...the three pads light up fine so I know they're not physically damaged or anything like that but they just won't trigger...for example, the little midi light in FL doesn't light up when I hit those three, but it's fine for everything else (and obviously, everything else plays as normally)...I tried reinstalling the driver but I'm still having the issue, any idea what may be wrong or what I should check?