Analogue-sequencer

Wonder if anyone has seen similar issue and may have a suggestion:

Intel Mac Pro, Sysex Librarian, MOTU MTP AV (USB) with latest drivers,
P3 with v4 with memory upgraded.

I'm having a hard time getting a consistent dump of the same set of
banks from the P3 into Sysex Librarian.

It appears the P3 is not shooting out sysex at a constant rate or the
MIDI stream is corrupt.

I've got about 12 full banks of 8 tracks and my message count ranges
from 154 to 981 for different dumps and from 3.4 to 15.4 KB message size.

Will do a triple check later, but my cables, MIDI interface, and
drivers appear ok. I can do a consistent dump with my JD-800 via the
exact same setup.

Ideas?

Thanks!

-Jim