Nintendo Switch

Just so you don't have to buy or warranty a dock - try a different HDMI cable

My switch never cuts out when playing. Perhaps you have faulty hardware?

I've never had issues with the dock, I bought an off-brand one so I could play it in my room on my pc. But the stock dock is still in the living room whenever I want to play on the TV.

Hmm I have the original dock from launch and the Splatoon OLED variant, zero issues.

As already recommended , would try replacing a cable to rule that out.