I was afraid this would happen...
After a day of perfect usage, I tried launching the Notes app, and it didn't do ****...
After giving up, I tried clicking on the "Reboot" icon and it didn't do ****...
A few hours later, I tried taking a picture, and same ****...
Shut it down through the button (2s) and it was alright, until it hang up in the middle of the shutdown... NOW, I had to shutdown via the 10s method ("hard" shutdown)...
I didn't do anything all day except taking pictures and sending them via mail, and messaging...
And the phone never had this behavior before...

Later,
Chinoman10.