What do i need to do if my tv screen goes really fuzzy and vertical lines pop up all over my screen while playing xbox

If the problem is exacerbated by heat then it's mostly likely that the BGA graphics chip is losing integrity. This can only be solved by a replacement motherboard, and should be covered under the warranty as long as you do not open the xbox's case.
Try using it on a different screen just to make sure it's the xbox at fault.