The most likely cause of your DV220 continuing to spin after the cycle has ended is that the Wrinkle Prevent option has been selected. Please refer to the attached image with the Wrinkle Prevent button and indicator light circled. If either of these is lit up on your control panel, then it means this feature is on. Wrinkle Prevent will continue to tumble your dryer intermittently without heat for up to 90 minutes after the cycle is complete to help keep wrinkles from setting in. To turn it off, simply press the Wrinkle Prevent button again.
If the Wrinkle Prevent light is not on, a Sensor Dry cycle is selected and clothes are dry, then the dryer should turn off automatically. If this is not the case then your dryer likely requires service, which can be arranged by either submitting an online service request through the link below, or calling 800-SAMSUNG to speak with an agent who can assist you further.
Online service request:
http://www.samsung.com/us/support/o...- Ms. Samsung
answered 2 years, 11 months ago

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MsSamsung
SamsungHQ