My phone automatically switches to vibrate mode
 

I have a Titan, and this occurs with default Sprint and Alltell firmware.

Through HTC Home (6-panel) I usually use the profile tab to set it the sound profile to Normal. (BTW, what is the Automatic profile do?)

After a few hours of sitting idle in front of me, the phone will then switch to vibrate mode. Why?!?

This is an issue with the HTC 6 tab plugin. It has been fixed with more recent versions, though.

Try installing the HTC Home plugin found here: http://forum.ppcgeeks.com/showthread...ome+Customizer
It has the updated version under the heading "Windows Mobile 6 (Tested on Titan) 6Tab Home Plugin"

But make sure you uninstall the version you have now, and do a soft reset before installing the new version. I tried just installing over the old version and still had the profile switching problem.