I just got a Series 4 that I'm using as a second monitor for my home office. I've been noticing the same issue since hooking it up. Works great until I shut it off for the day then the next morning it claims there is no internet connection despite the fact that our Vizio in the den is connected and playing, the iMac sitting right next to the Samsung is connected, iPhone is connected.. etc. The router literally sits less than two feet behind the television with nothing between them. If I hold down the power button on the remote and force a hard reboot the TV works, but just turning it on like normal it will not. I just turned off the setting you mentioned since I don't use the mobile app for anything. Turned TV off and on and it came back up.. will see how it does in the morning. If that fails to fix it, I'm just going to run a cable from the router to the TV and be done with it.
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