Why is my screen unresponsive

Hello, i recently upgraded infinix hot x507(armv7 processor)to android 5.0.2 lollipop. ever since , ive been getting ghost touches and unresponsive screens that take even upto ten seconds or greater. i have the most common options like disabling usb debugging andreseting the phone but the error still persists. i didnt backup the nandroid for kitkat 4.4.2 so going back is not an option (unless someone can help with that.) how can i solve this??

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