Can we get a full tank shot to see where the brom is curently placed? Also, are the roots planted in the subtrate?
With my current Neo., in the summer up north (Northeast), it gets very humid, usually 60-85%. So this brom wasn't planted but rather as an experiment, I treated it as a epiphytic-type of plant. About three weeks went by and the tip of the brom looked like the picture you posted. I ruled out the plant wasn't getting enough light, as there wasn't any way the roots were rotting since they weren't in dirt.
This same brom is now in one of my vivs where the humidity is kept at 80-90+%. It is also under 2 T5HO bulbs in a 24x18x18 Exo, and the roots are still currently not planted in my subtrate. I have not encountered a problem with the leaves 'browning' since then.
Hope my experience with my big brom will help rule out some variables.