I'd have thought that would depend how the switch has "broken down electrically" I envisioned that by pushing the key down (closing the contacts) and wiggling in in the full range of movement it might be rubbing off any patina that might have built up on the surfaces. I also speculated that the contacts might wander around a bit and that by giving them a wriggle they could re-centre themselves.
All I can say it has worked to restore my (relatively young) Matias QC switches, and I has saved me having to return the product.
I notice a lot of the incidences of chatter correspond with catching a glancing blow on the key you intended to hit or not driving the key through the full action of the switch. The bounce issue - as I am experiencing it - is as a feature not a bug as it is training me to strike the keys more cleanly and consistently. Probably why I might be coming across as somewhat defensive of this perceived failing in this thread.