Mind providing me with the current software version you are running? Have you already attempted unplugging the TV or a factory reset of the TV?
I am having this issue as well, had the tv for a year now, turns off every time I try to use it. It seems as if this issue is an on- going one as I have been on forums that report this for several years including this one. Is there a fix or should I give up on this tv.
Model numer for my tv is un55j6201af
If your television is powering itself off/on, and you have tested unplugging the unit as well as all software/firmware is up-to date (for those that can still access the menu), then service repairs would be recommended. To check warranty status you can message us here: http://bit.ly/2igAXKH
If the unit is out of warranty and you need pricing information, you can seek local authorized repairmen using this link: http://www.samsung.com/us/support/service/location
I am having the same issue as well. My model is UN40MU630D, Serial Number: <HIDDEN>, Software Version: T-KTMAKUC=1123.2, BT-S. I purchased this TV through Costco Online. The TV shuts off randomly and sporatically. I have had this TV for only 3 months. I am planning to return this unit. Very disapointed with this product.