A family member of mine had the same issue, they ended up spending I think it was roughly 70 ish bucks and bought a D-Link power line adapter in which would turn power plugs into hard line ethernet connections with an adapter, we set it up and gave the TV a hard line connection, and works great now.
Doesn't quite help you with the wireless issue, but if you wanted that is a route I know that has worked around the wireless issue.
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