I have a Heat-n-Glo Tiara 1-B that the pilot goes very low after several hours of use and will not re-lite the burner. If I turn the gas supply off to the stove until the pilot goes off, then back on again and re-lite the pilot, sometimes the pilot will be normal size and work again for awhile. After a short time the problem will repeat itself. I'm thinking about installing a new pilot assy including the thermocouple and milivolt generator. Any thoughts?