I currently have one of my amps on loan to a friend because his Eden WT400 is playing up. It's 6 months old and appears to have lost all bottom end and a majority of it's total output. He returned it to the store, plugged it in and they decided the amp was definitely the culprit. 6 weeks later, they're now saying they can't find a problem with it. It apparently plays OK now? I want my amp back, but I don't want to take it from him until we know his Eden is going to be OK. At present niether of us trust his WT400. Have any other Eden users experienced anything similar?