Err. I've had the same issues. Cleared the cache partition and I'm on my 6th factory reset, trying different troubleshooting as I go.
Initially, I let the phone restore from backup. Same issues. Freezing, not responding, then eventually restarting. I have NOTHING to tie this to except the Facebook app, which put my phone into a boot loop four days ago. After that, I cleared the cache and didn't reinstall the app. Now, I have nothing but issues. I've removed the SD card, it's not even IN the phone at the moment and it's still acting like a little b*tch...
I've gone into developer mode and turned off the transitions, I've also disabled S Voice from the home key.
I finally have factory reset "as a new device". I went from there - one at a time, updating ONLY the apps that were stable and did NOT have recent (in the last week) updates. It would RESET during an app UPDATING. I'm wondering if it's TouchWiz? My phone is unstable, unusable and useless to me without apps on it. The only way it's running without issues is if I don't dare update a single app.
HELP. Anyone? Advice??