iPod touch keeps freezing on various apps

Hello norita,
And welcome to Apple Discussions!

Have you tried resetting the iPod yet? To do this, press and hold both the Sleep/Wake and Home buttons together long enough until you see the Apple logo appear.

If you are running iOS 4 or later, you should also make sure to close out of Apps you are no longer running. You can do this by double clicking the Home button to bring up a list of recently used apps. From there, tap and hold your finger on any on of them until you see a small red minus sign appear in the upper right hand corner of each. Go ahead and tap this sign to remove the app from the list. Too many apps in this list can lead to issues like the one you are currently experiencing.

B-rock

Tried resetting it but it still doesn't get the bottom mouse bottom working.

Are you talking about the Home button at the bottom of the iPod? The circular shape one?

Have you tried restoring the iPod yet?

If you are referring to the home button, it could potentially be a hardware related issue. I would recommend taking it in to your nearest Apples store to have it looked at.

B-rock

I have not tried restoring it yet. That's something I do with it hooked up to the comp right?

Correct. Here is more information on it if need be.
http://support.apple.com/kb/ht1414

It might also be possible that there is a bit of dirt,grime, etc that is caught around and underneath the button. It might not hurt to try and clean it using compressed air to blow some of the debris out. Others have stated that rubbing alcohol has worked, but it is a liquid and has the potential to further damage your iPod. Here is a thread with more information on it.
http://discussions.apple.com/thread.jspa?threadID=1969583&tstart=0&start=0

B-rock