How to fix colored lines on the screen of the ZTE Quartz?

Hey guys. It looks to me that that's a hardware issue. It is best to take it back to the store where you bought the phone for experts to check on it.

Wish i knew...been battling mine for cpl weeks... Now the screen is starting to slow down (when i wont)...i have to restart... Then it'll act normal for a bit...then starts slowing down again

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