What do you do? http://knowyourgems.com/stmap_79pra02.html?amateurole.tube.usatube ls loli forum  The phrase 'reasonable length of time' is deliberately vague and the answer should depend on a common sense judgement - if the problem is due to standard wear and tear you are unlikely to have a claim, but if there is an unexpected fault you could be entitled to a refund or replacement.