System shutting down due to clipping?

I was able to reset the avr to 6 ohms. At high volumes with dynamic passages it still will shut down. I think I need an extra amp for the surrounds only or else replace the speakers with 8 ohm boxes.

As usual.....good ideas. i will get to work. thanks

I checked the manual and this newer model AVR does not have a 6 ohm option. The surrounds are set to small and I did dial back on the master max volume setting.
I am not going to replace the AVR since it is fairly new. I will consider changing out the speakers if I cannot get this fixed. I do not want to "turn it down" since the system needs to play at the volume level I want. It is suppose to please me and I am not going to play at a low volume in fear of the system shutting down. If the problem is overheating as Elizabeth suggests then a fan should certainly help. I just have to figure out how to wire one into the system. More testing tonight. And no I wasn't playing it on 11.

I am not sure it is heat either. The unit in on the top open shelf and doesn't seem hot. What do you think?

Erikt
I have the Yamaha RX 1000. Not sure if it has pre outs as you mentioned. The Sonic Frontiers preamp has a bypass switch so the mains are running off 2 Aragon Palladium monoblocs. The Sub is self powered and the Yammy is also running the center.

I have had this setup about a year. The shut down has only started in the last 2 months and only when I have things cranking ...like a concert dvd. The Snell center is also 4 ohms. The AVR is rated at 105 watts @ 8 ohms. The center is
rated at 90 db sensis. and 50 watt min, 250 w max. Not sure about the Canton surrounds but I do know they are 4 ohm.

I just got off the phone with Yamaha....was only on hold for 50 minutes !! yipeeee. The tech said this AVR can be reset to 6 ohm by holding down the power button and the Straight button during power up. I will try that tonight after work.
This should help and would be cheaper than any other option
if it works.

This is not an "older model" New last year. Still under warranty.

OK , the system still shuts down at concert level volumes. Strange thing since it never use to do that before. It has been reset to 6 ohms but that made no difference.
I may try hooking up the old NAD 2700 amp I had before to see if that would cure the problem. I have to get it back from the guy I traded it to months ago. I still wonder if the AVR is defective. I do hate to ship it back even if it is under warranty.

Avgoround
"Then, make sure all speakers are crossed over up higher, and take some strain off the receiver."
Not sure what you mean here? The powered sub is has an adjustable crossover but the center and surrounds do not.
The mains are run on the large monoblocks