cymbidium - sunburn? or something more sinister?

[Kailyn]

Hello
I have had this cymbidium for awhile now. Its been looking rough since last year when I think it got too much sun on its new growth (I had to cut a lot off last year). The new growth this year looks good initially but now is developing the same black spots as the new growth last year (its moved away from the sunny hot window) i have another one thriving in the same spot. is this one just more light sensitive or is it possible this is a fungus or virus related issue? ( i recently repotted and the roots look pretty healthy. it could stand to grow some more but i'm pretty certain root rot isn't a factor here). Any advice to save it would be appreciated, I have never seen it in bloom and don't often find cyms for sale so I would to keep it if it isn't a threat to my other plants.