macbook air to samsung tv with hdmi cable displaying 'no signal'

Hi there,

I am having trouble connecting my macbook air to my samsung tv with an HDMI cable.

I have tried two different HDMI cables (both brand new) and the same thing has happened.

1. at first, it works fine
2. after a few days of use, the tv displays 'no signal'

I have tried the following things to fix it:

1. resetting the SMC on my macbook
2. https://support.apple.com/en-us/HT201177 all of these steps
3. https://forums.macrumors.com/threads/thunderbolt-to-hdmi-problems.1631182/ checking my firewall is off
4. checking the input source on the samsung tv

Please could I have some help to fix this?

I am having trouble getting through to any other kind of apple support.

Thank you,

Natalia