I know this is a slightly old thread but I am experiencing the same problem as the original poster.
This is the story:
I started out with a Samsung UN46F6300 Smart TV. As soon as I got it home and plugged it in, updated the firmware and set everything up, the TV would reboot at random times. Some times it would reboot if i would attempt to change the volume. Press the button, light would flash on lower right corner of TV acknowledging the input but the volume wouldnt change ... 3 seconds later, reboot. Other instances would be half way through a netflix movie - it would start stuttering and then the tv would reboot. Another would be playing an Xbox 360 game in game mode - random reboot.
I immediately returned it for the same model. Got that one home, didn't update the firmware so that i could rule out new firmware as the cause... SAME THING! Weird reboots described above. Updated firmware to 1116 and still the same problems.
I immediately returned the second one and was going to replace it with a 50" version. The manager gave me $150 off for my troubles and sent me off to a salesman to complete the transaction. They ultimately didn't have one in stock and set one in place for next day delivery to the store. Next day, they forgot to load the TV. Again off to a manager, pretty well upset, and again they offered me $150 off a 55" 6300 series. Awesome!
Not so awesome. I got the UN55F6300 home the next day, set it up (this one was already pre loaded with firmware 1116). Figuring this tv is pre loaded with the firmware that i might have better luck. After viewing it for about an hour I went to change the volume and got the same exact problem as above. Non responsive volume and a reboot 3 seconds later.
Samsung was contacted with the first TV, they said it needed repair. Now, explain to me how THREE tv's all experience the same problems - they ALL need repair? Did Samsung have a serious problem with the 6300s?
I am unsure if this is hardware or software related. I haven't tried turning off the wireless connection to it yet. i would hope that isnt the problem, who would want a smart tv without an internet connection?
I honestly have been on google, forums, troubleshoot threads for a week now trying to find out what is going on with these 6300 series TVs. I am at a complete loss. Samsung just wants to send someone out, but after three tv's fail with the same problem ... is it even fixable?
Please if anyone knows anything or can point me in a direction i would greatly appreciate it.