The only Apps I have downloaded to my phone are:
Farmers insurance
Go sms
Facebook
Words with friends
Astro file explorer
Google+
Power amp
Vignette
My phone was fine since day one when I got it. Then a couple weeks ago is when this all started. But I have had these apps on my phone since day one.
And sometimes when I go to turn my phone back on it doesn't even make it past the HTC screen before it turns off again. Some times it makes it to the T-Mobile "stick together" screen and sometimes it makes it all the way to the lock screen until I go to unlock it and it shuts off. And this isn't a daily problem either. I can go days and days before it happens again.