EXS 24 Logic Sampler Users Group

I'm having quite a bit of trouble with the legato tool (vsl opus/logic 
6/os 9). it seems to work fine quite often, but every now and then 
I will get into a track where it seems to insist on getting stuck. 

Even if a note is a new articulation, clear of any other note by 
beats, it still sounds the legato version of the note, as if it was 
connected to the previous note still. Any note I play at that point is 
the legato approach sample from the previous note, even if that 
previous note was played stacatto seconds earlier.

If I reboot it is good for a pass or two, then gets stuck again. 
What can I do? Any ideas? 

Thank you! Darcy