Has anyone experienced the following Phenomena i.e. where the glass of the double glazing unit completely shatters without any apparent reason? If you have, can I ask what (if anything) was done about it e.g. was it replaced under some special kind of warranty or guarantee? The inner safety glass of our double glazing unit has shattered but we are informed that as the glazing unit is approximately 3yrs old it no longer supports any warranty. Furthermore we are also informed that such warranty would not cover this issue & although it could normally (with agreement) be a 5yr warranty period, this would only cover the units e.g. seal failure. Further communications gives rise to the possibility of something called Nickel Sulphide Inclusions and this is well known straight from manufacturing level right down to the trade but (to the best of my knowledge) is seldom presented by name to the public consumer? These Nickel Sulphide Inclusions (NiS) are said to be something of a rare occurrence but there appears to have been many large problems around the world concerning it. My thoughts on it, if it is now indeed such a rare occurrence why has the public consumer been left with the problem, the stress and the responsible for the replacement billing finance when it happens?