I have a frigidaire electric front load dryer and it won’t stay running. After pushing the start button it stops with in a minute and the drying, cool down and extended tumble lights are flashing. The door seems to fit tight but I went ahead and tried holding the door closed and I have tried unplugging it for 5 minutes. Thank you for any help I may get. 
Here is the tech sheet, try running the diagnostics
http://manuals.frigidaire.com/prodinfo_pdf/Webster/134682200ts_wd_EFS.pdf