Rheem Furnace sometimes takes a couple of ignition...

Question

symptoms:
1) Thermostat sends signal to furnace when temp drops.
2) Exhaust fan comes on for a minute or so.
3) Ignitor comes on and glows.
4) Gas turns on and ignites.
5) After about 10 seconds gas turns off.
6) After a few seconds ignitor glows again.
7) Gas turns on and ignites.
8) Sometimes gas will stay on, heats the house and turns off as designed. Sometimes it repeats steps 5,6 & 7. Other times I have to turn power off to reset the logic.
Is this a faulty thermostat in the plenum? Is this common with Rheem Furnaces?