USB power failure-Freezes

I have a new Mac Pro bought in March of this year. Since then I"ve had several instances where my keyboard and mouse just stop working. Caps Lock won't light up. Mouse won't move. I'm using a wireless apple mouse with fresh batteries and when the keyboard loses power, it loses power. No typing can be done. I've unplugged the keyboard, waiting a few seconds and plugged it back in and still no power. The only movement I can make is shutting down an external USB drive and the error message will appear. I have to do a hard shut down and reboot and then the keyboard and mouse will work. On two occassions rebooting did not work. It took a second reboot. I have one USB SDHC card reader in the top front port. One iPod connected to the second front port and in the back I have the keyboard, one external wall powered USB enclosure and one Lexmark printer. All three back USB ports are used. My 2.8 gig Nahalem mac is running 7gigs of RAM as well. Not sure why the USB ports are just powering off but I'd love to acquire solutions to how to prevent it. When rendering or exporting it is a killer to have a computer freeze in the middle of that when deadlines are looming. Thanks

I found this. Maybe you can help decipher it.
/usr/bin/pmset -g log:
  Description:    Power Management logs
  Size:    726 bytes
  Last Modified:    7/13/11 11:06 PM
  Recent Contents:    Power Management ASL logs.
-> All messages with "com.apple.message.domain" key set to "com.apple.powermanagement".)
* Domain: filteredfailure
- Message: Sleep - Filtered Sleep Failure Report - Power Button Shutdown - Apps Failure
- Time: 7/1/11 4:45:58 PM CDT
- Signature: Power Button Shutdown
- UUID: B8701D65-7491-4F89-BCD1-65E449E9C630
- Result: Success
* Domain: sleep
- Message: Sleep: Apps Failure - AC
- Time: 7/1/11 4:50:09 PM CDT
- Signature: Apps Failure
- UUID: D6DE773F-FB40-47A8-A502-5E8E1F08C99A
- Result: Failure
* Domain: sleep
- Message: Sleep: Apps Failure - AC
- Time: 7/13/11 10:06:07 PM CDT
- Signature: Apps Failure
- UUID: CCFBC00B-0DA8-4FB5-9568-81E8A591CA78
- Result: Failure

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