HT-R667 having problems need help

I have been having some problems with my HT-R667. It worked fine when I first got it but after about a year I have had problems. When I turn on the receiver and tv it takes forever for the picture on the tv to come on. If I turn the tv on and off it will start to work after a few minutes. But sometimes the picture will be distorted. And after I turn it on and off again it will work. Now the Wii is doing it. When I switch over for the kids you can hear the Wii bit no picture. Sometimes I can't even get the Wii to come on the tv. Now my sound will only work on the all st channel. The other audio formats either don't have any sound or is so faint sounding you can barely hear it. I don't know if anyone knows a fix or has experienced any of these problems. I have seen there have been some issues with this model. Thank you to anyone that can help