I have lived in my Keigar home for almost 5 years, and where I can not fault the build quality, the lights in the bathrooms and kitchen have not been well installed at all!! It appears that which ever electrician installed these ceiling lights could not have had the correct diameter hole drill, so used the next one up.
Consequently the lights keep falling out of the holes.
I have complained about this on numerous occasions in the past, and I'm told that the house in out of guarantee. On the other hand it might be that the light fittings used are of sub standard quality