Paphiopedilum disease or fungus?

[MartinaM]

I recently acquired this Paphiopedilum Hsinyin Rubyweb X Hsinying Raisin. It has been in flower for a month and now a leaf has gone brown to the base and another two look like the pics. Is this a fungal disease? In only two days the leaves have gone from healthy to this. It has two center leaves which are fine ....for now. This is my only specimen of Paphiopedilum and it was kept away from all other orchids. This first leaf had been cut (not my work). The second was cut by me and sprayed with hydrogen peroxyde yesterday. Eeeek! Any help would be greatly appreciated!