My 4K smart tv developed a problem after 10 months. So far I've spoken to 2 American reps who couldn't understand me, emailed them twice, messaged them on Facebook, spoken to an English rep, supplied evidentential photographs of the issue twice, and have been waiting for a call back to finally arrange for an engineer to visit me for nearly a week. The whole process has nearly taken about a month now, to be honest I'm fighting a losing battle here. Samsung have the WORST customer service I've ever experienced, and will never ever be buying anything from them again!