Thank you for bringing this to our attention, you should check the exhaust vent in the back of your dryer to make sure it's not disconnected or visually damaged, this could also happen if the vent is dirty, here I will leave you a link to have tips on cleaning the exhaust vent: https://bit.ly/2KGDMPa.
If this doesn't correct the issue please feel free to contact us via out live chat: https://bit.ly/2qLSIlI, Facebook and Twitter: @Samsungsupport or you may call us at the 1-800-SAMSUNG. I am eager to hear from you soon.
^Johnny