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Random reboots are usually from one of 2 reasons...
1) an Application crashed or hung up the system... (think of how a Windows PC will "Blue Screen" or just reboot)
2) you have an application (or too many applications) that are eating up system memory to the point the phone just crashes.
Remember, smart phones are really just little, handheld PC's. An Android phone is nothing more than a Linux based computer you can put in your pocket and make phone calls with.
The "Blank Screen" where you have to pull the battery is nothing more than a worse case of the above. The phone locked up to the point it could not reboot itself. Again, just like when a PC locks up to the point you can't reboot it and you have to hard power it off.
Go in, look at what applications you have running. Launch the Task Manager app and see what's running in the background. Any that are not needed, long-press on them and add them to the Auto-Kill list.
Also, reboot the phone once in a while. I reboot mine every couple of days, regardless of if I think I need to or not.