I'd say it is more likely an issue during production. They are cheap to replace !

http://www.rtbb.com.au/catalog/product_info.php?cPath=44_158&products_id=2880

Thanks nino not questioning cost of replacing though. Just checking to see if I'm unlucky or should look further into the matter. I think you're probably right I just wanted to avoid the old keep replacing fuses syndrome without fixing the real problem.