I searched around and tried to find some info on this issue. Here's what's happening:
Because I'm using Wireless Sync for my work email, it forces me to use a pin to unlock the phone after 30 minutes or when coming out of standby.
I found the registry keys involved here:
http://forum.xda-developers.com/showthread.php?t=317107
I tried the Zenyee StayUnlock program but it's not working. Anytime I sync it resets the registry entries. It's a real pain
Anyone else have this problem and is there a better workaround?