"Part 1 - Output 2L" resets itself after going to sleep. Virus TI desktop.

Hi,
I use my TI on hardware mode (no USB, no Virus Control).
I assigned Part 1 to go out on Output 2 L.
Most of the times, after i put my TI to sleep, and then the next day i turn it on again, the sound of Part 1 is coming out from Output 1 L+R.
If i enter the settings, the Output 2 L is still selected, but not working. So I have to go switch the setting to another output and back to 2L to make it work again.
This doens´t happen if I put the unit to sleep and i wake it after a short while. It seems to happen after i let it sleep some time.
Any ideas?

Sorry for not clarifying, i´m on version 5.1.7.00. I think its the last available version.

I already did, I had one reply, waiting for the next one. Its taking some time. I´ll post here after I have an answer.
Thanks !