Solved! Lenovo Miix 510 unable to connect to the TV and router at the same time via WiFi, but only when the screen is mirrored not extended.

Sep 25, 2019
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When I use the TV as an extended 2nd screen this doesn't seem to be the case. Can anyone explain what's causing this?
 
Sep 25, 2019
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That sounds really strange, but not a bad idea.
Reading your comment I realised that there's another thing I forgot to mention. It's not that I absolutely cannot connect to the router, but frequently disconnects, and I cannot reconnect after that. So to be precise, there are small windows when I'm connected to the router while mirroring my screen.
This seems to make what you mentioned less likely.