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There maybe a few issues. They have multiple safeties on furnaces. With this in mind this process to find the problem would take a Technician to check these safeties. It could be a flame sensor or thermocoupler each senses a flame or heat to keep the gas going. Also the damper for the flue must open for the gas to stay on. There may be more safeties on this and each safety sends a 24 volt current back to control module in order for the gas valve to stay open. If these aren't being met it will try around three times and go into a lock out mode which will keep gas shut off entirely.
Are all your supply vents open? The furnace may be oversized or have a air blockage. Have you always kept the filter changed. Newer heaters need the ducts sized right. If the new unit has worked great in the past then it's probally not the duct work.