TV turns off after 20 sec, then on again and repeat

[Mardahl]

Hi, 

I have a 2½ year old Samsung Qled 8K R900RA 65" TV, and now it's somehow "software" broken.

After I used my Apple TV to broadcast a video to the TV from a mobile phone (which we have done many times before), and we turned the Apple TV off.. the TV suddenly started shutting down by itself.

Now it's: I turn TV on (plug in power), after 20sec it turns off and restarts, on for 20sec and so on. 

If im quick i can enter the reset menu and reset to factory settings. And then the tv starts as factory default and WORKS! but it only works until i have finished the setup/installation procedure, then its back to power off after 20sec.

It's a really annoying fault. Seems very software related. The has a OneConnect box, where all cables and power supply is.

I have tried all kinds of reset. disabling auto power off and all that. Only have 20secs from power on though.

Any clues for what this can be?

Thanks

//Thomas

#Q900

[JAMES4578]

Hi @Mardahl  if you still have this issue can you check you have the latest firmware  1325.2 which became available May 2022 https://www.samsung.com/uk/support/model/QE65Q900RATXXU/ 

if does not solve the issue try a soft Reset  by holdng in Power Button for around 5 seconds till the Tv reboots and/ or unplug Tv and cables for around 5 minutes. However may need to Reboot Router  or change the DNS  Settings .  Go to  Network-Network Settings-DNS Settings.   Change from Automatic to   to 8.8.8.8 or 8.8.4.4 (Google Serves) alternatively  208.67.222.222 or  208.67.220.220  (Open DNS)  Same information on DNS here https://www.lifewire.com/free-and-public-dns-servers-2626062 

However if to no avail possibly a fault with the Tv.