Just purchased a 55UJ635V yesterday. All setup fine, no issues. Last night tried playing some 4k content via YouTube and Netflix and it just couldn't get going really - thought it was odd, and initially was worried that my 40mb connection wouldn't be enough. Anyway, went to fast.com via the browser and found that I was only getting 0.5mb connection speed, whereas my phone in the same room was getting roughly 35mb. I'm connecting to a Vodafone 5ghz router. I disconnected from the wifi, and reconnected via WPS and it all worked again. Netflix and YouTube were loading content almost instantly - great! That lasted for about 20 minutes and then back we went to a crawl of 0.5mb. I have my Sky Box behind the TV and the TV before that and it's never struggled for signal so I don't think it's that, the router lives just 5-6ft away. I don't want to invest in homeplugs for a 1 day old TV, especially when it's proved that it can connect at 35mb and deliver 4k content via wifi. Any help or suggestions appreciated.