I'm having your exact problems with my TiBook which I have had just over a year as well....
EXCEPT, I'm still in OS 9,2 because of an ongoing project using Quark. I'm wondering if there's a problem with the main drive. In the middle of working on my computer, it goes to sleep and I've disengaged the "sleep" mode. Also, the drive tends to spin to start and then dies. It takes several attempts to get it sstarted. Also, it spins alot and for the past 2 months, I've been getting a broken folder when I start up. I take the computer through the TechTool and through Disk Aid and find nothing wrong. Everytime I get a broken folder (about 6 times in 2 months), I insert the OS 9 disk, take it through "verify" and "repair " and then reboot, it starts up again. Incidently, the first aid did not repair anything because it did not indicate anything needed to be repaired. I'm now finished with my last job backed everything out of the computer and will do a clean install. If this persist, I'm bringing the TiBook in to the Apple Store. I've been happy and not been happy with the PB. I loved my old PISMO I sold to get the TiBook. I wish I didn't.
Anyone else having this problem. images/icons/confused.gif