cattleya with rotten roots

[oscar freak]

so decided to repot my catt yesterday as the exposed roots were starting to burn,the plant is i though in good condition but when i pulled it out i found a mass of rotten roots in the centre,the outside roots were fine.i cut off as much as i could,added some cinnamon powder and repotted.placed it a sheltered position and praying it will be ok.i'v been watering twice a week obviously to much i suppose even in summer?