HDMI connection to Samsung TV flickers

I have a MacBook early 2015 with 10.13.6 and every time I connect my Samsung TV via HDMI (using the apple required dongle), I need to rest the SMC otherwise the TV picture constantly flickers on-off-on-off.

I also have to be really particular about the way the SMC is reset (as it does not always work), that is I keep the TV HDMI connected then shutdown, then hold shift-control-option-power multiple times for 2 secs or more, then boot the MacBook with the HDMI still connected. It usually works but sometimes takes multiple attempts which is so annoying.

I also read posts where some people cannot get the flickering to stop at all so I suppose I am lucky, but I usually expect apple equipment to just work especially for graphics and screen issues. Does anyone know if this is fixed with Mojave? Any help would be appreciated.

thanks