Tuning problems are not always about strings or technique. A lot of "mystery instability" starts earlier, during transport, when small knocks shift contact points, compress padding, or stress the neck over time. If you gig weekly, commute to lessons, or carry a build between workspaces, protection becomes part of your stability plan. The right case reduces movement inside the shell and limits sudden shocks that your setup cannot absorb. In this article, we will discuss what impact does, what case features matter, and how to shop smarter.