Believe it or not, I've read this entire thread, as well as the entire WM6 thread by Helmli (thanks!).
As has been posted before, the fix for the phone returning to vibrate automagically is to remove the profile tab from the HTC home plugin using the customizer here:
http://forum.ppcgeeks.com/showthread.php?t=6355
However, I am stumped by something basic, here:
1. Which tab is 'profile'? The tabs I see are home, 'favorite people', weather, launcher, music and sound. These are represented, as I understand it, by the numbers 1 - 6 in the customizer.
2. How do you remove the tab? The HTC Home customizer has two options categories, "HTC Options" and "Optoins". The only tab function I see is "Tab Order" under "HTC Options". Is this where you go to remove a tab? How do you remove one and which of the above is the 'profile' tab?
Thanks all!
edit-
I have seen this mentioned elsewhere, but cannot recall if it is in this thread - on another apparent bug (Verizon):
The phone will attempt and fail at a data connect (#777) through the cellular network while it is cradled with Activesync. This call will fail (error code 37) and the phone will then go into a loop of trying to dial and displaying the error continuously. A soft reset is required to clear it up.