Unsure of exact age of this range but the problem is when the oven switch is turned on the oven light sometimes flashes- while flashing oven elements do get warm but soon the oven light quits flashing and elements dont produce heat- flashing is quick faster than an auto turn signal and some time it doesn't flash just comes on for a second and then goes off- Is the problem with the switch or something else. I could not see the oven temp capillary tube in the oven. Thanks