I own a 6 to 7 year old R-V1105. In the last couple of weeks it has started to shut/turn itself off in the middle of listening to either 5.1 sources or 2 channel. I can turn the receiver back on and it will sometimes run for an hour or two without shutting down and sometimes it will shut back off in a couple of minutes or even seconds. The top of the unit does not seem any warmer than usual, I've checked all the wiring to make sure there was no cross wiring and have tried plugging it in at a different electrical outlet. Does it sound like the power supply may be going bad? And if it is, what kind of repair bill would that bring? I'm just wondering if it would be worth it.