Wednesday at 3:30 p.m my treo went into a reset loop. Would turn off and on then try to start the phone, then reset.
This would continue till I did a warm reset. (take out battery, hold the up button while inserting the battery till the treo showed the network screen)
I later did a hard reset after backing up my data. I also have BackupMan.
But to no avail. It was still in a reset mode.
I called my carrier, Alltel. They are sending me a new phone.

My old one was still under warranty.
I don't know what caused it. I did download mvoice as a trial over a week ago and the trial ended a few days ago. I downloaded Diddlebug at the same time.
I will keep you posted how the new treo works out.