brown spots on Laelia rubescens pseudoulbs???

[mollyminiveg]

Hi,
I am new to orchid growing and within the last two weeks, 2 out of 3 of my Laelia rubescence alba pseudobulbs have been turning brown or have brown spots, and wrinkling. The third one is green and big and has just flowered. The climate is dry where I live so I have the orchid on a humidity tray and was using a humidifier for a while next to it. It gets direct sun for 3 hours in the afternoon when it's not cloudy. There are no bugs. Are these pseudobulbs dying? I water every other day or every third day and mist once a day. Your sugestions would be very helpful. Thanks





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