Vanda roots yellowing-help?

[Orchidreamer]

I just got a large ascocenda a week ago. It has two very long, thick roots. Each large root has several "side roots" growing out of it, which are all about 3" long. The problem is that the side roots are dying. The side roots begin to turn brown at the area where they attach to the larger root, and the remaining portions start to turn yellow and wrinkled.

There's also a "crack" on a larger root, and the area below the crack is turning brown and yellow too. There's still about 7" of healthy, green root below the crack.

What's wrong? Anything I can do?

I'm hanging it by the windowsill and I'm soaking it 2 times a day for 10 minutes. Humidity is around 50-60% and temperature is 83 deg F.

Thanks for any help!