Hi Greg,
Thank you for reaching out to us and we are glad to know that you are using Samsung products. We apologize for the inconvenience of the range oven having temperature issues. We truly understand that this causes inconvenience especially if we are cooking/baking our favorite dishes. Don't worry will surely notate your experience about this matter for a better service in the future.
I highly recommend visiting these links for basic troubleshooting steps:
https://www.samsung.com/us/support/search/?query=Range&referrerPageUrl=https://www.samsung.com/us/support/
Samsung oven temperature issues:
https://www.samsung.com/us/support/troubleshooting/TSG01204529/
Samsung range or wall oven panel is blank, blinking, or partially or incorrectly displayed:
https://www.samsung.com/us/support/troubleshooting/TSG01110183/
Clean and care for your Samsung electric cooktop:
https://www.samsung.com/us/support/answer/ANS00060833/
How to clean your Samsung oven:
https://www.samsung.com/us/support/answer/ANS00049011/
If repair is needed, please take note of your warranty coverage:
https://www.samsung.com/us/support/service/warranty/NE59J7850WS/AA
If you need further assistance, please reach us through the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Reference Ticket number: 1144496152
Thank you for choosing Samsung. Have a great day.
-Trisha-