Reset is not a fix. Don't expect Panasonic or the BBC to fix the problem. Either buy a set top box or contact the ombudsman and see if they can help. I'm afraid we have bought a product which is not fit for purpose?For me at least, this seems to be the common link for when I get this problem. IPlayer worked fine when I first got the TV (58DX802B). When they introduced the beta with 4k Blue Planet, it worked when you watched the footage but as soon as you closed it down and tried to restart it, you would get a blank screen. I have reset to factory settings several times but every time it lasts a few watches before it refuses to load again, and usually after you have played around with something 4k. Was hoping that either the BBC or Panasonic would have worked out how to fix it by now.
What's even more annoying, is that when you watch a BBC programme now, it displays 'Press button to watch this from the start', which of course tries to load iPlayer, so it doesn't work.