I hope you have better luck than I did https://eu.community.samsung.com/t5/audio-video/ht-j4500-home-cinema-cycling-on-and-off-repeatedly/m..., had exactly the same problem in June with my HT- J5500 home cinema unit. Contacted Samsung and sent back my unit to RepairTech on the 29th of June for my 'Free of Charge Repair'.
Last week I received a call from RepairTech to advise me that they had checked the unit and it had passed all their tests and the fault was something else and that I would have to pay to get it repaired.
So I requested the unit to be sent back unrepaired and have now decided never to buy Samsung again!
Just ordered a new Yamaha surround sound system today! and will replace my other Samsung products over the next few years! (2 phones, 2 TV's and Washing machine).
A real shame considering that I use to be a real ambassdor for their products.... but it's a lesson learned too much of a coincidence that my unit failed at the same time as everyone elses.... onwards and upwards and goodbye to Samsung.
