Same exact issue here with a HT-J4500. Started this afternoon. This is definately not just a simple failure. This is either a firmware update fail or someone planted a timebomb in the code.
I am not sure this can be fixed because of the short cycle time of the reset. There maybe no way to stop it to load new firmware.
I have the same exact problem, down to the letter, and it does sound like a firmware push\update during the early morning hours after 2:00 am. I don't see how it could be corrected without manually uploading new firmware, unless there's a hidden submenu that would allow you to go back to the previous firmware.
Same! I have two of these HTSs and both are acting up today. Support number suggested a repair man. This is obviously programmed into the system to stop working on this date. Please fix this Samsung! Very expensive paperweight!
