Two weeks ago, I dropped my iPhone 5c on the sidewalk. It hit hard enough that it shattered the screen. Besides the shattered screen, the phone worked perfectly fine.
I got the phone screen replaced by an aftermarket company a few days after it was dropped.
When I got it back, every now and then the phone would freeze and/or one half of the screen wouldn't reply to touch. But I just brushed it off as my iPhone being stupid.
Now about a week and a half after the phone was fixed by an aftermarket company, the phone is just going crazy. Most of the time, the phone will freeze and/or not respond to my touch. However the home and power buttons work fine. Also, sometimes the phone will register that the screen is being touched when no one's near it. I've been locked out of my phone a few times now because the phone is saying that someone's entering a password when no one's touching the phone, it'll pull up the email app for no reason, stop responding to touch, etc.
Is this an easy problem that I can fix myself? I've restarted my phone and it didn't help at all. ANY help at all would be greatly appreciated.