On-board HDMI monitor options/issues?

[silsrf]

I purchased a SmallHD OLED Focus for my A7lll. I like many things about it, but having issues with using AF in 4K Movie mode. I know it is not supposed to work. The odd thing is I did have working AF and tracking while in 4K Movie and with the HDMI external monitor, but then for some reason it stopped. The AF toggles on/off when you plug and unplug the ext HDMI monitor.

I started reading about the Atamos Ninja V and it sounds lile quite a great option, when you add in the cost of cables and SSD's, it is considerably more than the SmallHD.

What other options are out there to consider? External HDMI monitors, primarily for 4K Movie mode, but not exclusively? And yes, it sure would be great if I can still use AF tracking.

Appreciate any thoughts on the topic.

Henry