We have a three year old dryer that the drum roller seized and fell off,I replaced the roller and now the dryer starts and then shuts off after 30 or so seconds. The timer continues to run but the dryer itself stops after 5-10 minutes the dryer will start back up and run another 30 seconds. I have checked the switch on the idler pulley,cleaned out the vent tubes,motor,etc. Any ideas??