Dryer started turning off on its own and you could manualy restart but, now doesn't turn on at all.
With the dryer not turning on, you will want to check the door switch for continuity. It sounds like the switch may be defective and causing intermittent shut of but finally went out and causing the unit to not operate at all.
Dry is not reaching full heal capacity. Good air flow, igniter lights, gas flames then after a 10-15 minutes flames shut down. Is this the Heat Detector/Flame Sensor? Or some gas solenoid going bad?
Answer Mike, Based on the post description, you'd want to start at the gas valve coils 279834. These are electro magnets, and can become weak and stop lifting the internal plungers after the electricity has flowed through the coiled wires for a small amount of time.
Please double check your reference for the proper resistance on this item. Per the service sheet at the link: http://appliancejunk.com/forums/index.php?topic=8333.0, it should be around 100K ohms. Both of mine measure out there and the dryer operates.
Answer Brad, Based on the diagram, Your thermistors are NTC(negative thermal coefficient) The higher the temperature the less resistance produced through the thermistor. At room Temperature (78 dgrs.F)the resistance should be 98 to 102 thousand ohms +/- 10 % across the terminals,with the wires disconnected. Thanks and Good Luck