hey i bought new TV in friday....i have xiaomi mi box S so i connected it to TV + pc to TV. tv was working...its still is but on sunday i bought 4k HDMI splitter to split video signal coming out of my pc to monitor and new TV. couple hours later i was playing game and after 30 minutes in game some lines were showing on my screen. i instantlly got scared my TV screen is cracked or broken because it was looking like that but i turned off TV and turned it on again and it disappeared. TV was working fine before i got HDMI splitter. it happened only one time. i checked HDMI cable if they are connected properlly in TV and they were so i am thinking HDMI splitter causing my screen problems.