When I come across this the first thing I do is unpack a shiny new HDMI cable (just the 10 buck Amazon basics) and connect up to another HDMI port.
Sometimes it helps.
Intermittently TV tends to lose HDMI handshake. After every few days when I try to use any HDMI device connected to TV it start to give message "no signal". When I switch it off and turn it on after few hours it will start to work. The issue will repeat after few days. Due to this intermittent nature of this issue I can't even get a technician to look into this. Please help to resolve this as this is very frustrating, it is not even a year that we bought this TV.
I have uploaded a video for the isssue here: