Hi, i‘m the new owner of RS250 two days only. I have a question, if i turned off the power (power cord connected), RS250 in the standby mode. But i found that the top case and back case were still very warm, i mean the device is still working, is it normal (ok)? or all of hifirose products like tha? i think that is wasting electric power, any advise on these? thanks a lot!