Keynoteコミュの突然リブート？？

MacOS 10.4から10.5.1にかけてのことですが、Keynote '08がたまに、スライドショーの開始ボタンを押したとたん、突然システムごとリブート（再起動音から始まる）することがあるのですが；

・皆様のところではそのようなことはありませんか？
・なにか対処方法がありますか？

私の現在の環境はMacBook Black 2GHz, 10.5.1です。この現象は、10.4.xの時代から観察されています。

CrashReporter logはなくて、system.logに以下が記録されています：

Nov 26 01:08:45 ****** Keynote[311]: The function `CGPDFDocumentGetArtBox' is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance. Please use `CGPDFPageGetBoxRect' instead.
Nov 26 01:08:45 ****** [0x0-0x23023].com.apple.iWork.Keynote[311]: Mon Nov 26 01:08:45 ******.local Keynote[311] <Error>: The function `CGPDFDocumentGetArtBox' is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance. Please use `CGPDFPageGetBoxRect' instead.
Nov 26 01:15:55 ****** /Applications/iWork '08/Keynote.app/Contents/MacOS/Keynote[311]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Nov 26 01:15:55 ****** /Applications/iWork '08/Keynote.app/Contents/MacOS/Keynote[311]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.

↓突然リブートしたのはこの時だけ。

Nov 26 02:55:53 ****** /Applications/iWork '08/Keynote.app/Contents/MacOS/Keynote[201]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Nov 26 02:55:53 ****** /Applications/iWork '08/Keynote.app/Contents/MacOS/Keynote[201]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.