My iPhone 5s keeps spazzing out after I replaced the screen?

I used to have an iPhone5 but after I broke the screen, it started to spazz out, open apps without me touching it, would open something completely different to what I had tapped to open.
I decided the phone was no good, so I got my old iPhone 5s repaired (also had a damaged screen) so I repaired the screen and now this iPhone5s is doing the exact same as my old iphone5! Does anyone know why my phone keeps spazzing out?

It sounds like whoever repaired the screen didn't know what they were doing. This is why I would always have the Apple store do any repairs.

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