Phalaenopsis with unusual leaf change: advice? Last resort!

[Yanquister]

This has been posted in a couple of forums, but members directed me to repost in OTHER columns so I was a little confused (please don't consider this spam, I apologize for the inconvenience if I misunderstood. Below if my original message with photo.

Need help with a Phal please! I tried to read all through the sticky and (unless I missed it, for which I deeply apologize), what in the world is happening to this leaf? This has been one of my happier plants and they have all given me year round blooms AND a priceless hobby (flowering spikes or not). The last couple of days I noticed this one had a withering leaf, and my water schedule (around every 8-10 days in this humid climate in south MS/LA area), but the leaf looks horrible! Has something gone wrong or is this natural? My others have never done this (yet), and as of now they have all been perfectly healthy and flowering on their own time (one phal after blooming four months miraculously showed up with two new spikes, and this one was considered one of my healthier ones! Please? Any advice to give this worried phal lover please?? (I've tried to attach a photo but I'm using my iPhone, please let me know if it doesn't work!)

Thanks so much guys, you and all your info/input is just a wealth of information that I read religiously!!!