I would think you will have a hard time getting anything covered by warranty. I wouldn't say it is a common issue. Being that are from the NT, isn't there an issue with carpets moulding due to humidity, hence most houses being tile floors? Possibly worth a read: http://ntnews.com.au/news/only-in-the-territory/culture-shock-for-driver-as-mould-takes-over/story-fnk2tg5d-1226812807005