Probably from too much light. ðĄ It is really common for the leaves ð of plants to become brown or scorched ðĨĩ when there is too much direct sunlight, a sign that every plant ðą owner should look out for! Be sure that it gets plenty of water ðĶ, too!
pothos can be very sensitive so try limiting amounts if light like if it is indoors have half the plant get light and rotate the plant like every 2 days
I'm not convinced it's a light issue- when my pothos had too much light, the leaf tips were dark brown and crispy. I'm seeing brown near the leaf as stems vs the tips, which makes me think it's something else. Could it be root rot?