BEEPA, software updates should be an improvement not a problem. Let's figure out what happened. How did you connect before? What happens when you do that now?
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Both TV's involved are Samsung's. The way I've always connected is by selecting 'Screen Mirror' on the TV then I turn on the screencast from my S8+. Then both the phone & TV connects then drops, connect then dtops. Will not hold connection. I doubt it's the TV's. Always worked in the past....