Thanks friends. Maybe I don't have always perfect timing in triggering fills but I don't have these issues with my Ketrons, Rolands and Yamahas. As far I can remember, these issues had been going for a while now since my early Korgs.
I know there's no perfect keyboard, but this Pa1000 is almost for me except for this glitches.
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Jim

SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9