Just yesterday, my Mogul started acting up. I won't update e-mails from Yahoo! and Gmail on the scheduled intervals, and when I have PIE open and loading a page, the connection will change to the icon for "connection idle", even though there are service bars. Then it will go back on for a second and download part of the page, then go out again. I'm in a great EVDO coverage area and have never had this problem before. Here are the changes I've made to the phone in the past 24 hours:
Uninstalled Wizard Dialer
Installed Phone Weaver
Configured Treo Alerts
That's it. I don't know what would be causing this...