the symptoms you are experiencing / describing lead me to believe you are using a USB drive for recording?
please give more details about your system.
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a SANDRA report would be helpful as well.
taken from the
General Troubleshooting Thread :
Note: To enable other users to help you, please include all of your system details when posting an issue to the DUC; Pro Tools hardware, Pro Tools software version, CPU, OS version, Motherboard make/model, chipset, amount of RAM, type of hard drives used, etc.
- SiSoftware's Sandra Lite application can be used to post your full system profile:
www.sisoftware.co.uk
Under SiSoftware Sandra, click on "Download & Buy" to download the free Sandra Lite version or purchase other versions. After installing Sandra, click on the 'Hardware' tab and run the 'Computer Overview', then copy and paste into your post here on the DUC.