I've done some research, and apparently (correct me if im wrong) it's because of too much RAM usage. However, i set the phone to notify me when free RAM is less than 50MB, and it never did. It just pulled an auto-reboot on me.
Should i worry about this? Is it normal; basically 100% guaranteed that it is because of low RAM?
Which leads me to this: I ALWAYS questioned all the things i had running at the same time. That's probably the only thing i don't like about the phone. Things start automatically. I have an EQ program, Groove IP, and the Music Player running at the same time. I don't understand why the phone won't just close apps if they aren't in use... Or at least if there was a more streamlined way of closing apps. Not going into Settings,Apps,Manage Apps, Running... That's pretty stupid, if you ask me... If there are alternate/better methods, i'd like to know them.
Back to the point, though. Should i worry about this reboot? And, what exactly is the cause/is it RAM usage?