Holding down the power button on the remote each time I want to turn it on until I see the Samsung Logo always works from me. It's a pain, but the easiest solution for someone who isn't so tech savy.
I just solved the wifi problem. I tried everything. I called Samsung twice and they helped me try everything again. Finally, the second gal said I have a problem that they don't know anything about and I need to call a licensed Samsung repair facility. So I called. They said they would come out for $109 to assess the problem and charge me possibly more to fix it. I said thanks but no. I found a used wifi module on Ebay. I easily installed it today (YouTube cideo) and wifi works perfect! The first Samsung tech gal was rude and unhelpful. The second gal was more knowlegeable and helpful, but lied through her teeth when she said Samsung has no knowledge of any wifi issues. THEY SHOULD STEP UP AND GIVE EVERYONE A NEW WIFI MODULE AS SOON AS THEY CALL. THEY KNOW ABOUT THIS PROBLEM AND SEEM TO BE USING IT AS A PROFIT CENTER FOR THEIR SERVICE REPS. BS.
I sent you an email reply. I hope you got it. I thought I'd answer here as well FBO others. The answer is that there are several different wifi modules. You have to figure out which one your TV has. You can take the back off your TV and see the part number of your wifi module. My module was down on the lower left. It was easy to remove, identify and replace. Or you can go to ShopJimmy.com. You put in your TV model number and it tells you the wifi module part number. You can buy a wifi module on Ebay or from ShopJimmy. ShopJimmy also has helpful videos. I'm not affiliated. I didn't buy mine from there. I found one used on Ebay for under $10.