Disklavier

I may be crazy, but it seems like that when I record something on my 
DC3A via the built in recorder it doesn't seem quite as accurate as 
when using SONAR3 (via the MIDI connections to my PC) to record the 
same piece of music.  Anyone else notice this?  I have been 
recording pieces with SONAR3, converting them to MIDI and then 
playing the files on DSK.  For some reason, this seems to work 
better than using the internal recorder and then just playing back.  
Especially for complex piano pieces (ie. lots of notes..)  I could 
be dreaming.... SJ