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Capacitors are rated with a finite life span. Some last longer than others. Going up in voltage rating doesn't necessarily make them last longer. A certain Samsung VCR I used to service, quite a few actually, a multi-standard NTSC-PAL-SECAM model, would come in dead with failed 10V capacitors on the 5V supply line. Even replacing with 25V capacitors would still fail! Just a crappy power supply design. Seemed to have so much harmonic distortion in the output of the SMPS passing through the filter capacitor to ground even with an inductor ahead of the capacitor, would cook them internally. Brand-new low ESR Panasonic or Nichicon cap would run warm to the touch from the get-go.
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