IPhone 5C is really slow, freezes up, and has blackish vertical lines, then shuts off?

I Have had my iPhone 5C since last December and it worked perfectly! Now I have been having issues with it. My phone will glitch up a lot! I'm updated with everything and I have about 3GB of storage. I have very few apps. Just the past few days it will show black vertical lines on my screen and won't let me do anything! It eventually restarts itself and is perfectly fine after… It's annoying! What could be wrong?!

Did you drop it? Normally it doesn't just start messing up, make sure you don't leave all apps open in the background and make sure you have some space available on it.

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