Phalaenopsis orchid shriveled and wrinkly roots

[luckylucy]

Hello,

The phalaenopsis roots sitting on top of the bark medium are shriveled and wrinkly. Some are dry and whitish grey. However, most roots within the bark medium are fairly green and normal. At first I thought it was ok for roots to be dry at the top of medium however they look ghastly thin and the dryness is spreading down to the roots in the medium.

My watering schedule is once a week where I run water through it thoroughly, let it drain out and then water it again with a mixture of water and liquid fertilizer. It is currently summer here in NZ, should I increase the watering to twice a week?
These past two days I've been misting it with water in the morning and have placed it on a humidity tray however I do not see a healthy change. Do I need more patience? What am I doing wrong? What should/shouldn't I do? Please teach me! Thank you

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