TX-SR507 retain settings after power loss?

I've had this receiver for a couple years, it has always lost settings (tone,SP level cal, surround sound mode, etc) even with a momentary power loss. Is there a battery or capacitor in there somewhere needs to be changed? Power flickered twice this week the trouble of having to redo everything is getting on my nerves.

I would advise to have this unit further evaluated at an authorized service center. Please contact our Parts & Services Dept at the number listed below during normal business hours Monday-Friday 9am-5pm EST ; or via email at parts@us.onkyo.com. They can be contacted at 201-785-2600, option # 4 for Parts & Services as they can further assist you regarding warranty and service issues. You will need to speak with the Parts & Services/ Warranty department for any servicing options or resolutions available for your issue. They may be able to offer you a more suitable option to resolve this issue you are experiencing; please provide to them a copy of your sales receipt and serial number of this receiver as well.

Best Regards;

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