I also have a Samsung UE40ES6300 TV and yesterday it suddenly stopped finding my or any other wireless nestworks. 

I have reset the router, factory reset the TV and it still won't find any wireless networks. I suspect the wireless card in the TV has failed. 

I also have a UE40ES5500 TV and that suffered the power cycling issue. We paid to have that fixed, but then over time found that Amazon Prime, Netflix etc were no longer supported and the apps were removed from the TV without any warning. We bought the Smart TV for those services and similar services and to find that within a year or so, services were just removed is appalling. 

I suggest that someone from Samsung contacts me to explain or resolve the issues above, because as it stands at the moment I do not rate Samsung build quality, longevity in service, or customer service highly at all. I will not buy any Samsung products again - that goes for TVs, consumer products, mobile phones, tablets or PCs. Someone at Samsung needs to realise that these are expensive items and the fact that they just fail after a year or so in service is not good enough. They seem to treat these items as disposable items with a working lifespan of 1 year.