Hi, I was given an AEG 58v mower by my parents for Christmas but they lost the receipt and now it's cutting out all the time after a short run. It's not the batteries because they work fine in my AEG line trimmer and blower. With no receipt Bunnings are saying there is no warranty but it's not 12 months old yet. Any ideas as to what to do. AEG want proof of purchase as well for warranty. Any ideas anyone.