Remember the Red Ring of Death? Of course you do! It was one of the biggest low-points in the history of Xbox's 22 years in existence, and the vast majority of early Xbox 360 owners ended up experiencing it at least once.
The saga was documented extensively in the "Power On: The Story of Xbox" documentary a couple of years ago, with the team explaining that the issue was ultimately related to thermal stresses caused by regularly turning the console on and off over time, resulting in a 1.15 billion dollar cost to offer free repairs for every system.