I had a similar problem where mine would switch back to the audio screen every time it came out of standby, hibernate or reboot (using Vista). Turned out to be a combination of a skin.ini command to switch to "audio" everytime the skin was loaded, and the skin was being reloaded by the external gammacontrol program I was using when it tried to ensure the correct day/night screen was selected. The gammacontrol program could also be set to issue a skin change command for day/night everytime it was restarted via a timer. It could also be set to refresh that periodically, like every X seconds, which would cause a problem like you describe. So it would be a timer issue, just not in the actual skin.
It took me quite a while to figure out what was going on, with a lot of help from the forum members here. But in the end I learned a lot about how Roadrunner and skins work, so I'm glad I had the problem!
Here is the line in my skin that was causing the return to audio. The skin is iDrive.
"ONSKINSTART","SETVAR;NIGHT;0||SETVAR;SNIGHT;0 ||R UN;$skinpath$DNSwitch.exe||AUDIO"
Here's a link to the thread where we figured it out:
http://www.mp3car.com/vbulletin/road...-new-post.html
I am NOT an expert at all with this stuff, so please take my comments appropriately!