Probably 95% of the time this is from the gas valve coils. The part # for a kit with both coils is 279834. You can try unhooking the vent from the back of the dryer to eliminate the venting as a problem. If it runs ok without the vent hooked up that is the problem. If it still won't keep heating thru the cycle replace the valve coils.
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Check the complete venting system inside the dryer and to the vent outside. Be sure and check for lint & god knows what around the blower wheel. Get everything 100% clean. Insert a thermometer into the vent coming out of the dryer with the vent hose off. Start the dryer on high heat & see if it will go to not over 180% and start going lower like 130% or so if it drops back it's ok . If it don't stop & go down cycle thermostat is most likely bad. The reason it won't start for an hour may be the motor gets too hot. You could put an ohm meter across the connection on the cycle therm and heat it with a small torch or something & see if it will show open after heating. Just a guess lots of things cause these problems. Clean that motor too. Lint may cause it too run hot.
It may be your dryer vent piping. If the piping from the dryer to the outside of the house is clogged with lint (which happens periodically) the dryer cannot get rid of the heat generated by the gas burner. When the temperature reaches a certain level the high limit switch opens and shuts the burner off. The switch closes again after the dryer cools down. Check the lint filter and all the vent piping for any obstructions and clean out thoroughly. This should solve your problem. Hope this helps.
Your vent may be obstructed causing the dryer to trip, once it cools down it will reset itself.
The way to see if thats the problem is to disconnect the vent and run the machine, if it doesn't shut off, you will need to clear the vent.
Watch the burner assembly, shortly after starting the
dryer the ignitor should begin to glow. If it glows for several
seconds (up to 15 seconds) and then goes out, then the problem
is probably the solenoids (coils). If the ignitor glows and stays
on, then the problem is usually the flame sensor.