Leaves on new pothos are slowly turning yellow/dying
I recently got these two pothos and the leaves/stems are slowly turning yellow. Plenty of light throught the day and it's about 10 feet from a window. I'm in Washington and it's the summer here. I water about once a week, not sure exactly how much water, but doesn't seem like too much or too little. I got the plants from marketplace, so not sure about the soil.
In the video, I point to the leaves that I am worried about.
Help and thanks!