USB timeout problem

Hello I am using angstrom version

Booting kernel from Legacy Image at 80300000 ...
   Image Name: Angstrom/2.6.28/beagleboard
   Image Type: ARM Linux Kernel Image (uncompressed)

Everything is working well, except that after about 5 to 10 hours
everything connected to the usb hub is dropped. I was wondering if
there was some variable somwhere that I need to change in order to be
able to leave the beagle on for extended periods of time while
maintaining the usb connections.

Any help is appreciated thanks!