Droopy branch on healthy plant, what can it be?

First thing I'm thinking is root related issue (damage, rot, water saturation) or something like a stem borer. How's the drainage in that pot?

Hi there, thank you for the comments. The branch have no visible damage, it's a branch coming from the lower tip of the main branch, almost touching the soil. I never saw anything like it, so droopy day by day and the color and stiffness is 100% healthy. It can be wind damage, there were some days were the wind was quite a bit by the afternoon, but what kind of damage the wind could do unless breaking the branches? Over watered...maybe. But the rest of the plant is doing really good...not sure. For the rest of the options I think they are not the reason. I'm open for wind and overwater... but it's really really strange...

It could be several things. Damaged branch, wind damage, too hot, over Watered, under Watered, not enough light, containers too small?

Generally fungus gnats don't hurt anything so I don't think that is your problem. Is there any injury or damage to the one sad branch?