I have a leak at a supply line valve under a bathroom sink. I've read through several "suggested" posts, but it appears every leak is different. In my case the leak is almost non-noticeable when the valve is fully open, but as soon as I try to shut it off, it that's spaying water everywhere. This valve is original (I think) with house and so is about 25 years old; no other valves have had issues like this
This issue is: 1) very recent; 2) has no obvious cause, e.g. it wasn't jostled by something or pipes frozen or anything; 3) no other valves, e.g. the one next to it, are showing any similar signs.
It seems clear it is not the supply line or connections that's at issue. Mostly I am just trying to understand if I should replace the whole valve, or if symptom might be indicating something simpler.
Other than that, if it is a failed valve, any thoughts as to what might have caused it...just time? If just age, should I replace both, and others in my house on a preventative basis?
30-second video of what happens when I try to close valve: My Leaky Valve