FWIW - As long as I keep my AVR635 in stand-by mode, I don't lose the settings. Of course, actually turning it off, or the smallest brownout, dumps them.
Eventually, I will open the thing up and modify the cap so I can replace it without ever having to solder it again when it needs to be replace again - and it will need to be replaced again. If you think it won't need to be done again, you are dreaming.
My unit was serviced under warranty within the first year I owned it. Had the problem where it turned itself off when it felt like it, then the tuning crystal for the component cables started going. I personally drove it over 50 miles to the service center. While there, the tech performed all service bulletins that were outstanding on the unit - including some jumpers between boards. The tech also re-heat flowed every circuit board to ensure all the solder joints were solid. Other than the bad cap issue, I have have no problems since the warranty service with this amp in the decade plus that I have owned it.