slow playback

[Roshan]

okay, so i'm really new to the protools world, so bear with me.
last weekend our band was recorded through a digi 002 rack system.
the files were transferred to my hard drive, and everything seemed fine.
but when i play back the session, the first minute and a half sound fine, but then everything slows down.
the singer's voice gets deeper, and the pitch gets lower, not to mention the tempo of the song slows.
has anyone experienced this before, and is there a way for me to speed everything up?
any help would be appreciated.
thanks

[JesseF]

I never heard of a session slowing down once it had already started, but you should check to make sure that the sample rate mathces that of the original.-

[ricupad]

That's really weird... a possible explanation would be that in the middle of the recording session somebody switched on or off a digital device that was hooked with PT, threfore changing the sync in the middle of a song. That once happened to me, when I was doing some overdubs recording into ADAT and the engineer switched on the computer in the middle of a take, of course everyone noticed it because the basic tracks slowed down, but if you played all at the same time, this might have happened unnoticed.

Unfortunatelly I don't know how to cure the situation. Perhaps dividing the song into two sessions and then trying to convert the sample rate on the other or something, then paste them together again...

[Roshan]

i'm not really worried about that first song, but how can i convert the whole session so the rest of it sounds right?
thanks for your help.