Hello KR,
If your microwave starts by itself with no interaction, unplug it, and contact us at the channels below.
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.commuity.samsung.com/t5/Samsung-Community/ct-p/us
When you message us, please provide us with this reference number (1151711909) to help our team pull up your information.
Thank you!
^Joshua