Bee, I myself haven't experienced your problem, but probably because I don't use the Tyros onboard sequencer to do much recording. I prefer to use Cakewalk Sonar instead, as it offers an easier to use interface and more powerful editing tools as well.

In addition to posting here, I'd recommend (if you haven't already done so), joining the SVP World forum:
http://www.svpworld.com/forum/

and posting your question on the 'Tyros specific' message board:
http://www.svpworld.com/forum/forum_topics.asp?FID=7

Good luck,

Scott