The answer to 'shut-off valve making noise' is that a noisy shut-off valve is often caused by a worn or malfunctioning valve mechanism. This can happen over time as the valve components wear down, leading to vibrations and noise when the valve is turned.
Some common symptoms of a noisy shut-off valve include a high-pitched whistling or screeching sound, a grinding or rattling noise, or a valve that feels 'sticky' or difficult to turn. The good news is that in many cases, this issue can be resolved with a simple valve repair or replacement, which is often a DIY-friendly project for handy homeowners.