Why won't my phone work correctly?

Hi. My BLU R1 HD phone won't turn on correctly. The problem started yesterday. It kept shutting down at random times without me or someone else turning it off. After around two or three times turning it back on, small black lines began appearing on the white screen with black text. Then, after a few more times dealing with this, the white screen began showing colored lines, instead of the black ones on the same screen. Later, after I had gotten it working, sort of, I attempted to play a youtube video (https://www.youtube.com/watch?v=F9sH-3Ao... if that helps at all) and about an eighth of the way through, the video froze, about one second of the sound looped, and the screen was obscured by the colored lines mentioned before. I shut the phone down and tried to play the same video. Very close to the same timestamp, the video froze again, one second of the sound looped, and the colors inverted. Once again, I shut the phone down, and tried to play the video again. At the same timestamp, the first video problem occurred again. I wiped the phone, and let it charge overnight. This morning, I turned the phone back on, and it worked fine for about two hours. I reinstalled the apps that were deleted, then a few hours later the phone shut down completely and wouldn't turn back on for several hours. After those hours, I plugged teh phone in, and attempted to turn it on. It showed the white screen with black text, then one that was entirely obscured by colored lines. I tried this two more times, with the same effect, then the phone shut down all together and won't turn back on. Why is his happening and how do I stop it? Thanks in advance!