this dryer unit fgx831cs1 will start heating and cutsoff every two minutes and the burner comes back on and again the flames stays on for a couple of minutes and keeps doing this non stop , i replace the solenoids and completly clean an hose with a sem metal one, no obstruction , the timer will not advanced on the regular cycles automatic , but advances on the timed side.im leaning to change the cycling thermostat.