Replaced my cracked LCD screen - now it goes dim and unresponsive

Hi All,

I just replaced my iPhone 5 LCD screen for the 2nd time (it cracked again). Everything went well except I struggled replacing the front end camera but managed.

When I first turned it on I could see the screen but it had lines and the touch screen was going crazy without me touching it. I went back and reattached the LCD wires to the back of the phone. After doing this the screen worked fine however the bottom and top of the screen was pulsing with some light. I turned it off, turned it back on, this still occurred but my phone worked so I figured whatever I can live with it.

Eventually the weird light thing stopped and now the phone works fine - except last night I played clash of clans and after a while the screen got dimmer and the touch screen stopped working. Now every time I click too frequently in the phone the touch screen stops working so games and things are a no go. I can fix it by simply clicking the power button and unlocked the phone again but it keeps happening.

Does anyone have any ideas? I've been looking for answers but have found no one with this issue.

Thanks in advance for any help.