I am having an issue with my Onkyo HT-R510 receiver. After resetting and then unplugging the receiver from the power outlet all 6.1 speakers work. After a couple minutes the music just stops and would only work when i click "direct". Only the two front speakers work and the others are mute. I toy around with the settings and nothing turns the other speakers on. I get frustrated and do the steps all over again by resetting and then unplugging and it works again on all 6 speakers right away without changing anything. Has anyone ever had this issue or can help? Thank you very much.