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Aug 12, 2016 12:41 AM in response to Nimfa_zby seventy one,Could be wear and tear. Has it been exposed to liquid or damp of any kind?
If there has been any increase of dust in the air that could contribute; try using a stiff haired paint brush, the type you use for art, and brushing into the edges. Another possibility is to spray the edges with pressurised air.