It started last night when I turned my screen on. It threw about five error message saying "Unfortunately x has stopped" which stacked on top of each other and I had to say "OK" on all of them. Once that was done, my phone reverted to the "Samsung" screen that displays when it is first booting up. From there, it just kept booting up and staying on for about a minute before rebooting again. I removed the battery for a while, then put the battery back in but didn't turn the phone back on until this morning. It did the same thing.
Note that removing the battery worked the last 2 times this happened. I think it might have something to do with my phone being full. But pretty much all I have on there is my music, which gets added to every so often and I don't want to lose any of it. My phone is a Samsung Galaxy S4. I don't have a home phone so I pretty much need this for anyone who needs to contact me. Any ideas?