olypus TG-5 focus issue
I do not understand what is happening to you. If you are in manual focus mode, you should be able to focus using the up and down arrow while shooting video. I admit, I've never tried that because achieving focus during a video will produce too much out-of-focus material. I rather stop shooting; focus; and then resume shooting. Then, I put transitions in between when editing.
|My Garden by Mitchmeister|
from The Secret Garden
|Crowded Skies by Rushlin|
from Seven types of aircraft - lighter than air