I just bought a decent capo last month but it keeps sliding down the neck when I'm playing, which messes up the pitch. It's really frustrating because it seems to happen randomly, not just when I'm playing harder or softer. Is this a sign the capo is defective or am I doing something wrong?
Most likely you're not clamping it hard enough - capos need more pressure than feels natural at first, and if you're being gentle to avoid hurting your fingers, that's probably why it's drifting. Try tightening the clamp screw until it feels snug (not painful, but definitely firm), and make sure the capo is sitting perpendicular to the neck, not tilted. If it still slips after cranking it down, then yeah, there might be an issue with the clamp mechanism itself, but nine times out of ten it's just needing a firmer grip on the strings.
Could also be that your capo's clamping mechanism is worn out or the padding on the back is compressed flat, which kills the grip on the fretboard. I had a cheaper one do exactly that after a few months of regular use - started slipping like crazy even when I tightened it down hard. If you just bought it last month, check whether the rubber or felt backing still has any give to it or if it's gone hard and shiny. A decent capo should have some cushioning that actually grips; if yours feels smooth like plastic, it's probably time to swap it out for a replacement because no amount of clamping pressure will fix a worn-out pad.
Check whether your capo's padding is actually making full contact with the fretboard - sometimes the rubber wears unevenly or shifts during use, leaving gaps that let the capo rock sideways instead of gripping flat. I learned this the hard way when my old capo kept creeping down until I noticed the back corner wasn't touching the wood. If the padding looks compressed or separated, try rotating the capo slightly to see if a different part of the rubber grabs better, or you might need to replace just the padding if your model allows it. The other suggestions about clamping pressure are solid, but a lot of people don't realize the capo itself can be the culprit even when it's relatively new - manufacturing tolerances aren't always perfect, especially if it got jostled in shipping.
The padding angle matters way more than people think - if your capo's clamp is hitting the fretboard at a shallow angle instead of perpendicular, it'll slide no matter how hard you tighten it, because the pressure spreads out sideways instead of gripping down. Try repositioning the capo so the padded arm is square to the neck rather than tilted, and if that doesn't fix it, the issue is probably that your capo's padding has actually hardened or smoothed out over a month, which kills friction even with decent clamping force. A month in is honestly still warranty territory for a decent capo, so it might be worth seeing if the seller or manufacturer will swap it.
Your capo might actually be sized wrong for your guitar's neck profile. Acoustic necks vary more than you'd think - some are flatter, some more rounded - and if your capo was designed for a different neck shape, it won't seat properly no matter how hard you clamp it or how good the padding is. A capo that works great on one guitar can genuinely struggle on another.
Before assuming the capo itself is defective, try borrowing one from someone else and see if the problem vanishes. If it does, you've got your answer. If it still slips, then you're dealing with either technique or the capo not matching your specific neck. Many people don't realize they need to try different capo styles - some are angled, some have variable clamping mechanisms, some work better on curved necks. A decent music shop can usually let you test a few on your actual guitar rather than guessing blind.
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