You didn't tell me what audio interface you are using. Did you mean you are using the built-in audio ?
If not, download and install the latest driver for your audio interface.
If you are using a Firewire or USB audio interface, make sure it is connected directly in your Mac.
Do you have the same problem in iTunes or GarageBand ?
what about the sample rate for your project?
Does this happen regularly with other projects too?
Do you have any other application open?
Are you streaming the samples off your mac's HD?
What mac are you running logic on?
Have you done any maintenance on your mac - like repair permissions?
Sample rate is at 44100
Yeah it happens quit often even with other projects
Just running safari
Yes samples are from my mac HD
I'm running the new 2.4 ghz imac core duo
no haven't had any repair maybe I'm just running too much info and I need to freeze some tracks?
I think 2 things have a good chance of helping.
1. Maintaining your mac is v.important.
Quit all applications.
go to: Applications/Utilities/Disk Utilty
Select your mac's HD
Click on repair permissions
2. Turn off airport while using Logic and try quitting safari too.