Thats the thing, no one knows for sure since Microsoft won't talk. The problem is that the 360 actually has 3-4 areas with high failure rates. The disc drives, GPU heatsink being too close to other components and a few others I forget. It makes it hard to really nail down which one is causing the most problems without Microsoft fessing up.
Playing: Baldur's Gate 3, Cyberpunk 2077, Sea of Stars
Watching: Dark Winds, It's Always Sunny in Philadelphia, Our Flag Means Death