I have a 20-39cs right now. Eventually gonna get another one, but no idea when. Anyways, when I watch movies the Parts Express amp is great. When I listen to music at kinda loud volumes (-45 on my Yamaha rx-v1200) it will overheat and shut off after an hour or so. Is this common? Or could I have an issue I don't know about? I'll probably get a Samson s700 regardless, I'm just hoping they don't overheat as easy.