Pioneer htp-071 home cinema

Ok so this is my first time using one of these forums. I'm not even sure if i'm in the right section but I have just brought an lg smart tv and a pioneer htp-071 home cinema package. It is conected to the telly with a hdmi cable. When i first set it up it worked fine but when i turn it off (to standby) and turn it back on again it stops working. If I unplug it from the back of the amp and plug it in again it works fine! Obviosly I don't wont to have to do this everytime i wont to use it can anyone help?