I've had 3 shut downs since downloading 1.5. I did have a couple under 1.0 as well, but what makes it worse is that it won't let me turn it back on for about 1-2 minutes, which when I'm trying to make a call/text, can be an issue.
When I first installed 1.5, I did wipe/clear cache. Is anyone else experiencing this? Is there any steps I can follow to fix this?